A rebuild is the perfect time to experiment. The rebuilding club has nothing to lose and everything to gain. The rebuilding club can experiment with different players, giving as many a shot in the major leagues as possible to see what sticks, the endgame being to unearth some key pieces of the next winning team. This is one of the most commonly accepted principles of a rebuild — finding out what you’ve got. But just as a club can experiment with players during a rebuild, it can also experiment with ideas. Just as important as finding the pieces of its next winning team, an organization should also be looking to find the identity of its next winning team.
The rebuild of the Philadelphia Phillies is well underway. They cleared salary and replenished their farm system in a major way by trading longtime fan favorites Chase Utley, Cole Hamels, Jimmy Rollins and Jonathan Papelbon, as well as dominant reliever Ken Giles. The Hamels and Giles moves in particular appear to have netted the club substantial hauls based on early returns. Baseball America ranked their farm system among the league’s top 10, after having not cracked the top 20 in four years. The only guaranteed money on the books beginning in 2018 and beyond is a $2 million buyout for Matt Harrison. They cleaned house from the front office all the way down to the coaching staff. The youth movement has made its way to Citizens Bank Park. The future is bright in Philadelphia. Surprisingly so, given the state of the organization no more than a year ago.
It’s very possible we’re already seeing some of the key pieces of the next good Phillies team. If all goes according to plan, Maikel Franco will be one of them. Odubel Herrera could one day be a winner in Philadelphia. And then there’s the rotation, a 3:2 mix of unproven youngsters and stopgap veterans who have struck out more batters than any rotation in baseball this season. Jeremy Hellickson and Charlie Morton may not be the future for Philadelphia, but Aaron Nola, Vincent Velasquez and Jerad Eickhoff sure look to be.
And so not only do the Phillies seemingly have 60% of their next contending rotation in place just 14 games into their first full-on rebuild season, but they’ve already got their identity, too. Their pitching philosophy, if you will. The Pirates have their own inside sinker. The Mets have their own slider. These Phillies? They have their own curveball.

Team Curveball Usage and Characteristics
Phillies |
27.4% |
77.9 |
7.2 |
-8.0 |
2611 |
Athletics |
20.5% |
76.5 |
-0.6 |
-6.8 |
2510 |
Mariners |
19.9% |
78.3 |
5.0 |
-6.5 |
2345 |
Marlins |
19.4% |
81.2 |
6.5 |
-0.5 |
2470 |
Brewers |
16.7% |
78.0 |
6.1 |
-7.9 |
2458 |
Dodgers |
15.6% |
77.4 |
2.9 |
-8.3 |
2309 |
Astros |
15.2% |
74.7 |
8.6 |
-8.5 |
2487 |
Royals |
15.0% |
80.6 |
4.5 |
-5.9 |
2677 |
Padres |
14.9% |
79.0 |
1.4 |
-9.3 |
2281 |
Cardinals |
14.7% |
78.0 |
6.9 |
-7.1 |
2429 |
Twins |
12.8% |
78.3 |
3.9 |
-4.1 |
2506 |
Indians |
12.0% |
81.9 |
8.6 |
-3.4 |
2594 |
Rangers |
11.2% |
79.2 |
1.3 |
-4.3 |
2319 |
Red Sox |
11.0% |
78.6 |
7.2 |
-5.5 |
2512 |
Cubs |
10.6% |
79.7 |
2.3 |
-5.1 |
2462 |
Tigers |
10.2% |
79.1 |
5.2 |
-4.1 |
2436 |
Mets |
9.7% |
79.5 |
1.6 |
-2.4 |
2351 |
Blue Jays |
9.6% |
79.7 |
5.7 |
-6.2 |
2550 |
White Sox |
9.6% |
76.9 |
-0.7 |
-3.2 |
2182 |
Nationals |
9.2% |
78.5 |
2.8 |
-5.9 |
2633 |
Orioles |
8.1% |
77.2 |
4.6 |
-4.1 |
2235 |
Rays |
7.7% |
78.6 |
7.3 |
-6.0 |
2472 |
Rockies |
6.8% |
75.6 |
4.0 |
-5.2 |
2436 |
Braves |
6.4% |
76.7 |
6.1 |
-3.6 |
2396 |
Pirates |
6.4% |
77.8 |
2.7 |
-6.4 |
2179 |
Giants |
5.8% |
78.2 |
-0.5 |
-3.5 |
2424 |
Reds |
5.2% |
78.0 |
3.4 |
-3.7 |
2349 |
Angels |
5.1% |
75.1 |
5.4 |
-4.1 |
2332 |
Dbacks |
4.7% |
79.0 |
6.7 |
-6.4 |
2266 |
Yankees |
3.4% |
79.9 |
4.7 |
-5.7 |
2501 |
SOURCE: PITCHf/x (usage, velo, movement), Statcast (spin rate)
Nobody’s starters are throwing the curveball like the Phillies starters are throwing the curveball. More than a quarter of all pitches thrown by the Philadelphia rotation have been curveballs. The single-season high by a team in the PITCHf/x era is 24%, by the 2012 Pirates. After that, it’s just 19%, by the 2010 Cardinals. This Phillies team might have the most curveball-heavy rotation since we started tracking such things. Phillies starters have thrown 431 curveballs this season. No other team’s rotation has thrown more than 300.
But it’s not just that the Phillies are throwing a ton of curveballs, it’s how they’re throwing them. The average Phillies curveball breaks seven inches to the glove side, drops eight inches, and spins more than 2,600 revolutions per minute. Only three teams average more drop on their curves than Philadelphia. Only two teams average more spins on their curve than Philadelphia. Spin rate and vertical drop are the two keys to getting whiffs on a curve. The Phillies have those in spades. The Phillies aren’t throwing a ton of curves just because. The Phillies are throwing a ton of curves because they’ve mastered them.
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