Beginning last season, there’s been a raging debate concerning the identity of baseball’s best shortstop. In fairness, I guess, people have probably been arguing about this forever, but now there’s this outstanding, new, young crop, and it’s hard to believe they all exist. There are veterans in there like Troy Tulowitzki and Brandon Crawford, but you’ve also got Carlos Correa. There’s Francisco Lindor, and there’s Xander Bogaerts. Corey Seager! And maybe we’re supposed to include Manny Machado. There are so many good shortstops. There are so many good shortstops that I’ve left several out.

I’m very comfortable asserting this: Whoever might be the best shortstop in baseball, I believe it is not Aledmys Diaz. Diaz isn’t a premium baserunner, nor is he a premium defender. Remember, he wasn’t even supposed to be in the majors. But here’s a fact for you — Machado leads all players listed as shortstops in wRC+. There in second place, trailing by just five points, is Diaz. He leads everybody else. And he’s officially now a National League All-Star.

It comes off like a classic case of the Cardinals. In the middle of last summer, when Diaz was in the minors, he was removed from the 40-man roster. Anyone, at that point, could’ve had him. The Cardinals brought him back. The rest is history, and the present.

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Baseball fans’ brains are littered with obscure names and trivia. We all know names like Wally Pipp, Fred Merkle, and Johnny Vander Meer for their rather absurd places in baseball history. Five of those baseball names that may or may not be stuck in your brain for trivial reasons are: Freddy Garcia, Jamie Moyer, Gil Meche, Joel Pineiro, and Ryan Franklin. If that quintet is meaningful to you, it’s because every single game of the 2003 Mariners season was started by one of those pitchers.

In the modern era of five-man rotations, that team was the only one ever to get through an entire season without once turning to a sixth starter. It’s a trivial feat, but one that I find myself wondering year after year whether it will ever be repeated. Now that we’re halfway through the 2016 season, it’s time to assess the situation and determine whether or not this will be year of the second immaculate five-man rotation.

One-in-five teams have already used 10 or more starters this season and only two teams are left standing in my personal race to a perfect five-starter season: the Cubs and the Cardinals. Can either team match the 2003 Mariners?

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In 1990, Rickey Henderson came to the plate in the leadoff spot 588 times (out of 594 total plate appearances). He hit 28 homers out of that slot, walking 95 times and striking out just 60, en route to a .326/.439/.579 line as Oakland’s No. 1 hitter. He also stole 65 bases and was caught on just 10 attempts. All told, he produced a 10.2-WAR season that has since been eclipsed by only three position players: Barry Bonds, Cal Ripken, and Mike Trout.

Henderson’s 190 wRC+ mark in 1990 has been topped by a small handful of batters in the meantime, too: Bonds a bunch of times, Jeff Bagwell Mark McGwire. Bryce Harper did it last year, and Frank Thomas did, too, in the strike-shortened 1994 season. None of them provided such production out of the leadoff spot, however. By most criteria, it’s the greatest hitting season by a leadoff batter in history.

It will likely remain the greatest season by a leadoff batter after the 2016 campaign, as well. That said, Cardinals infielder Matt Carpenter is making a strong case for second-best.

In terms of pure value at the plate, Matt Carpenter is off to a great start. Carpenter’s .300/.419/.585 line has led to a .419 wOBA and a 167 wRC+ that leads the National League and is behind only David Ortiz in all of major-league baseball*. Over the last 365 days, Carpenter’s 154 wRC+ mark sits behind only Ortiz, Trout, Josh Donaldson, Harper, and Joey Votto, and his .277 ISO is the seventh best in baseball. Continued production at that level would give him one of the greatest-hitting leadoff seasons of all time.

*Numbers current as of Monday afternoon.

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Sunday morning, I was talking with Craig Edwards and some others in the lobby of a New York hotel. Craig, who as you probably know runs the Cardinals’ site Viva El Birdos in addition to his work for FanGraphs, lamented Trevor Rosenthal’s “shaky” performance this season. After checking in on Rosenthal and the Cardinals’ bullpen, it is even more clear than it already was that Craig is a kind man, for I would use other words to describe Rosenthal’s performance. It might be time for manager Mike Matheny to make a change at the top of the Cardinals’ bullpen.

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You don’t need numbers to gain a sense of how Adam Wainwright’s season has started. You just need Adam Wainwright postgame quotes. After his Opening Day start, he wasn’t “anywhere close to being excited,” and called himself “the definition of average.” The next start tied his “career-high-of frustration level” because he was “so upset about the way the ball [was] coming out.” After start number three, he postulated that he’d “made more mistakes these first three games than [he had in] entire seasons.” Start four: “still not great” and “getting tired of losing.” Following his penultimate outing: “The only way I can move on from that is I have to start over. It’s a new season for me from now on.”

That’s a brief rundown of the first eight starts of Adam Wainwright’s 2016 season, in words. I said you didn’t need the numbers, but now you’re going to get them anyway. Through those eight outings, Wainwright ran a 6.80 ERA. The FIP was better, but still a below-average 4.32, and the expected FIP even worse than that. The strikeouts were way down from what we’ve come to expect, the walks were up, and too many balls were being put in the air and leaving the yard. It was the worst stretch of eight games that Wainwright had had in nearly a decade.

Wainwright being 34, and his arm having had the number of surgeries it’s had, a start to a season like that raises some questions. It raises some questions that would be tough to ask to Wainwright’s face. He probably didn’t care about the questions, but he still wanted to give some answers to make the questions stop. Consider his most recent start like the beginning of an answer.

As far as professional athletes go, Wainwright is notably candid. If his stuff isn’t good, even in a win, he’s going to say his stuff wasn’t good. A couple of those negative quotes from the first paragraph came after victories. He doesn’t beat around the bush when it comes to his opinion of how he pitched. The key quote following his most recent outing: “I’m dangerous. You can say I’m dangerous again.”

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Harrison Bader is raking in his first full season of pro ball. The 21-year-old St. Louis Cardinals outfield prospect ranks second in the Double-A Texas League with a .351 batting average. Batting leadoff for Springfield, Bader boasts a .401 OBP and his slugging percentage is a sporty .554.

Last year, he hit the ground running after being drafted in the third round out of the University of Florida. Splitting his debut campaign between the New York-Penn and Midwest Leagues, the Bronxville, New York native put up an .891 OPS. This year he’s been even better, which he partly attributes to being a sponge.

Bader talked about his approach to the game, including his insatiable thirst for knowledge, earlier this week.

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Bader on how he identifies as a hitter: “I don’t see myself as a power guy. Not by any means. I think that’s evident from where I’m batting in the lineup at this level. I’m a leadoff hitter, so I’m expected to get on base as often as possible. I’m expected to work a lot of counts, have a high level of plate discipline and a good understanding of the strike zone. I also need to know my hitting zone, where I can do damage.

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Over the last couple of years, we’ve talked a lot about the Kansas City Royals and the ability of certain teams to sustainably beat estimates like the BaseRuns expected records we publish on our standings page. Famously, the Royals have won far more games than our numbers thought they would — over the last three years, they’ve won 25 more games than their BaseRuns Win% would suggest — making two straight World Series appearances and winning last year’s fall classic along the way.

Interestingly, though, with less fan fare, Missouri’s other team has also been winning far more often than BaseRuns suggested was likely. Over the last three years, they’ve won 23 more games than their BaseRuns expected record, nearly as many as the Royals. Last year, they won 11 more games than expected on the strength of an historic clutch performance. As Ben Lindbergh noted in a Grantland piece last summer, the Cardinals pitching staff was insanely good at stranding runners last year, so their run prevention ended up being fantastic even as their pitchers routinely danced with danger.

Six weeks into 2016, however, the tables have turned. The Cardinals are just 20-18, already finding themselves eight games back of the Cubs in the NL Central, except BaseRuns thinks they should actually be 25-13, which would give them the second best record in all of baseball. A year after posting one of the largest positive differences between expected record and actual record, the Cardinals have already won five fewer games than expected, and if they continued at this pace, they’d post the largest negative differential for any team in a single season.

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A.J. Pierzynski has played baseball for a very long time. He’s one of the few players to predate not only the PITCHf/x era (2007-present), but also the Baseball Info Solutions era (2002-present). He’s one of just six active players who played in the 1990s — the others are Carlos Beltran, Adrian Beltre, Bartolo Colon, David Ortiz and Alex Rodriguez. They are all well celebrated and beloved players. Pierzynski does not fit in that group.

If you’re familiar with Pierzynski, you likely know that his opponents generally have not been all that fond of him. A Google search for “A.J. Pierzynski hate” turns up plenty of results. Rather than focus on that, I thought it would be fun to find some nice to things to say about Pierzynski.

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It’s almost time to rip the first page from the regular-season calendar, and many players and moments have already left indelible marks that will live on in our memories. From Trevor Story to Kenta Maeda, from the Cubs and Nationals on the good end to the Twins and Astros on the bad, it’s been an exciting ride thus far.

There are a number of dominant pitching performances already in the books, with Jake Arrieta’s second no-hitter in as many years an obvious highlight. Just a week before his vanquishing of the Reds, the Phils’ Vincent Velasquez and the Cards’ Jaime Garcia unfurled identical game scores of 97 in complete game victories over the Padres and Brewers, respectively. Since it’s still early in the season, and sample sizes remain quite small, let’s use batted-ball data in a more laid-back, fun manner, and attempt to split some hairs among these three gems, and crown one as April’s most impressive pitching performance.

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Note: the editor of this post played no part in the composition of its despicable title. All grievances should be directed to the author, Craig Edwards.

Baseball is full of April surprises. Players who come seemingly out of nowhere. Albert Pujols was one such player back in 2001. So was Chris Shelton back in 2005, Devon Travis last year, and Trevor Story already this season. As Trevor Story has seen his production decline, another surprise has risen in the form of Aledmys Diaz, the Cuban-born shortstop for the St. Louis Cardinals. While many players have come over from Cuba after having received considerable attention and bonus money, Diaz entered baseball in the United States with much less fanfare. Two years after his signing, he is having one the most surprising — and one of the best — starts to a season of all time.

With few exceptions, Cuban players take an unusual route to professional baseball in the State — due, of course, to the relationship between the U.S. and Cuba. For Diaz to sign with an MLB team presented difficulties. Under the rules at the time of his defection, players from Cuba who (a) were 23 or older and (b) possessed a certain amount of professional experience, were exempt from international bonus pools. When Diaz entered the country in the middle of 2013, he indicated he was born January 8, 1990 (1/8/1990) which would have made him a free agent exempt from bonus pools. Other documentation contradicted that statement, indicating he was born on August 1, 1990 (8/1/1990). Due to the inaccuracy, MLB prevented him from signing for another six months.

Diaz worked out for many teams, eventually signing with the Cardinals to a four-year, $8 million contract in March. By the time Diaz started playing for the Cardinals, it had been a year since he had played competitive baseball on a regular basis. Diaz hit pretty well in 2014 but, due to injury, played in fewer than 50 games between High-A and Double-A — a result, possibly, of the increased workload after a period away from the game. Diaz then started slowly in 2015 — so slowly, in fact, that the Cardinals decided in July they could put him through waivers and remove him from the 40-man roster ,as they didn’t want to risk doing the same to Pete Kozma. With around $5 million remaining on the contract, there were no takers. Immediately thereafter Diaz started hitting, and he has not stopped.

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