With yet another day to go before actual baseball returns to the field, I thought I would take a quick look at some of the potential MVP candidates in both leagues based on the first half of the season.

Identifying MVP candidates is certainly not a straightforward process, nor is the criteria universally agreed upon. Knowing this I will not begin or end this article with any claim to have identified the “proper” candidates. These are my candidates based on my way of looking at the term “valuable”.

So what is my criteria? Well, I like to think of MVPs as players that provide an exceptional amount of production in both an absolute and relative sense. This means identifying players that lead or are close to leading the league in production, but where there is also a sizable gap between their production and that of the second best player on their own team. This means that I do tend to discount great performances by players that happen to share the same uniform as equally great players. Is it their fault? Absolutely not. In fact, those players could likely be the best all around players in the entire league. But when it comes to value I think there is a relative component that should be considered. This isn’t to necessarily give credit to the player (i.e. they don’t “step it up” to make up for the gap in talent on the team), but rather to the performance itself.

Like I said, this is my criteria and I don’t claim that it should trump all others, nor would I say it is complete on it’s own. Rather, I think it’ a useful starting place.

Okay, enough with the preamble. Let’s get to the data.

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The All-Star Game is over and it’s time to turn our attention to the second half of the season. All of the teams still in contention face questions as games get underway on Friday. We will take a look at those questions in two posts. Today, we’ll discuss what to look for in the National League when play resumes. On Thursday, we’ll address the American League.

The NL East is a four-team race. The Nationals are the leader in the clubhouse at the break, with a four-game lead over the Braves (five in the loss column) and a four-and-a-half-game lead over the Mets (six in the loss column). The Marlins are nine back with the Phillies in last place fourteen games behind the Nats. For the Marlins, that is a lot of ground to make up, but the NL East teams will play a lot of games against each other just after the All-Star Break. That could solidify the Nationals’ lead or tighten the race even further.

The Braves and Mets are essentially tied with the Giants and the Cardinals for the two wild card spots, just behind the Reds, who trail the Pirates by a game in the Central. The Diamondbacks, Marlins and Brewers sit three-and-a-half, four-and-a-half, and five-and-a-half back, respectively.

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Each year, about 15 minutes after the excitement of seeing who was named to the All-Star Game has worn off, the next step we take is to start carping about who didn’t make it. It’s a summer rite of passage as old as the game itself. Here at FanGraphs, we’re no different, so let’s take a look at the snubbiest snubs that were snubbed.

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The Braves came into the season with enviable pitching depth, enough that they were able to trade innings eater Derek Lowe to the Indians in a cash-saving deal over the winter. Tim Hudson missed the first month of the season recovering from a back procedure, but they still had a solid rotation led by Tommy Hanson, Brandon Beachy, Jair Jurrjens, and Mike Minor. The prospect trio of Randall Delgado, Arodys Vizcaino, and Julio Teheran provided depth at Triple-A.

Fast-forward three months and things have changed rather dramatically. Both Beachy (2.00 ERA and 3.45 FIP in 81 IP) and Vizcaino are out with Tommy John surgery, Minor has been awful (6.20 ERA and 5.51 FIP in 85.2 IP), and Jurrjens was so bad earlier in the year (9.37 ERA and 7.89 FIP in 16.1 IP) that he was sent to the minors. He’s since resurfaced to take Beachy’s spot and has turned in two solid outings. Delgado is doing about as well as a 22-year-old can do in the show, with a 4.52 ERA and 4.17 FIP in 79.2 IP. Overall, Atlanta’s rotation has pitched to a 4.22 ERA and 4.35 FIP, the 19th and 22nd best marks in baseball.

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Jason Heyward hit the big leagues in 2010 as a 20-year-old prodigy, but also with a skillset that is more commonly found among players in their mid-thirties. Heyward drew 92 walks in his rookie year — the most by any player in their age 20 season since Ted Williams drew 107 back in 1939 — and succeeded at the plate with an extremely patient approach, something you just don’t generally find at that age. Because of his selective approach, Heyward was an instant star even with just average contact rates and slightly above average power.

However, Heyward’s success didn’t carry over to 2011, as he struggled with injuries and his BABIP fell 75 points, cutting the legs out from under his batting average. While he was still drawing walks, the moderate power wasn’t offsetting the outs he was making, and his sophomore season was a pretty big step backwards for the Braves right fielder. Instead of comparisons to The Splendid Splinter, Heyward was starting to draw whispers of guys like Ben Grieve.

The first two months of 2012 brought more of the same, as he ended May hitting .233/.327/.413. He was still drawing walks, but he was making contact at the lowest rate of his career and still not hitting for a lot of power. After his early career brilliance, Heyward had racked up 600 mediocre plate appearances, and the questions about his ability to produce at a high level were only growing louder.

Then came June. For the last 24 days, Heyward has been a monster at the plate, and a totally different kind of monster than he’s ever been before. In 72 trips to the plate, he has 14 extra base hits and has only drawn three walks, leading to an un-Heyward-like .391/.417/.754 batting line for the month. That’s something you’d expect from Josh Hamilton or an on-fire Adam Jones, not the most selective young hitter we’ve seen come along in a couple of generations.

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I think it was Earl Wilson who said baseball is a nervous breakdown, divided into nine innings, or something to that effect. I imagine the Atlanta Braves are starting to relate to that sentiment.

On May 20, the Braves beat the Tampa Bay Rays 5-3 in rather classic Braves style — with a win, a hold and a save from Tommy Hanson, Jonny Venters and Craig Kimbrel. They were 25-15 and stood atop the National League East by a game-and-a-half and appeared to be a serious playoff contender — if not the likely NL East champs. Since then, they’ve gone 9-16, they’re 4.5 games back of the Washington Nationals and they’re fighting to stay in contention for a wild card spot.

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A number of pitchers with noticeably lower velocity this year either have landed on the disabled list or have had their seasons cut short due to injury. The Pirates’ Charlie Morton had Tommy John surgery (age 28, down 1.5 mph). The Tigers’ Doug Fister (age 28, down 1.1 mph) and the Blue Jays’ Brandon Morrow (age 27, down 1 mph) have both landed on the DL with oblique injuries. And the White Sox’ John Danks (age 27, down 1.5 mph) just started a stint on the DL due to elbow soreness.

Previously, I found that pitchers who lose at least 1 mph of velocity have over twice the odds of not throwing at least 40 innings in the subsequent year. This could simply be due to ineffectiveness, injury or both. A steep decline in velocity can create — or be a signal for — all sorts of problems. If a pitcher loses velocity simply due to a tired arm, they can increase their chance for injury by trying to pitch through it. Losing velocity also tends to make pitchers less effective over time. And once a pitcher loses velocity, the odds of regaining at least some of it the following year are very low (more on this below).

Today, I want to look at how age impacts the chances of regaining velocity for pitchers and then highlight some hurlers who fans should keep their eyes on this year and next year.

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Bryce Harper may have added to his legend with his game-winning hit in the Nationals’ 7-6 extra-innings victory over the Mets yesterday, but Ian Desmond’s night at the plate was more remarkable, according to Win Probability Added (WPA). Not only was Desmond’s game-tying double earlier in the final inning worth more WPA than Harper’s game-winning hit (.380 to .349), but his total WPA for the game was 1.017.

That’s right — Desmond’s contributions were worth more than one “win” according to WPA. Of course, that’s a bit of a deceptive way of saying it. WPA is measuring the shift in “probability” or “certainty” of winning given the relative score, inning, base/out state, and run environment. In a game like yesterday’s, with many ties that were broken, plus extra innings (any one of which could have been the final inning), there are even more opportunities for big WPA events. Thus, Desmond got additional big boosts from his game-tying single in the bottom of the eighth as well as his run-scoring reached on error in the bottom of the tenth.

How often do hitters end up with a single-game WPA over 1? Not often, but according to our database, it has happened 42 times in the regular season since 1974. In fact, Desmond’s big game is only the 35th highest score on the list. Each has a story, but here are three that I have picked out semi-randomly.

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My first thought after hearing Braves Tyler Pastornicky had been sent down was, “I hope his terrible beginning doesn’t define the rest of his career.” It would be unfortunate considering few expected the 22-year old to do much more than hold the fort, if that, as a rookie in Atlanta. And even though the results (-0.9 WAR) in 45 games ranked Pastornicky as the lowest performing shortstop in baseball, it does not mean he can’t rebound to have a long career at the big league level in some capacity. After all, Pastornicky opening the season as the starting shortstop was more a matter of timing than his truly being ready to contribute from the start.

Yesterday, Ben Duronio, resident expert on all things Braves discussed Pastornicky’s replacement in Andrelton Simmons and why he’s needed in Atlanta right now. He was spot on in his assessment, so no questions there. However, the comments section included this gem worth discussing in greater length.

Although I think the Braves are a well run organization, opening camp with Pastornicky was deeply flawed and had too much of a “wait and see” approach. Old School evaluations like “makeup” (son of a major leaguer) and batting average (with a ridiculous .398 BABIP in his brief and only AAA appearance last year) thrust Pastornicky in a role he is not and likely will not be suited for.

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Understatement: Jason Heyward’s 2011 season did not go quite as most of us expected. His (seemingly) long-awaited 2010 rookie campaign at age 20 mostly lived up to the hype, but he followed up with stereotypical “sophomore slump” season that was marred by nagging injuries, benchings, but most of all, poor hitting (relative to expectations, at least). Now 22, Heyward is so far may not be hitting as well as he did in his rookie year, but he is doing well. His resurgence over the first quarter of the season thus far is one reason the Braves are currently leading the National League East.

Many explanations have been given for Heyward’s 2011 issues, too many to deal with one way or the other. If it is not too boring, I want to focus on a couple different ways that “regression” was used in this particular case to see how it is sometimes misused, or, perhaps more accurately, used in a clumsy fashion.

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