Joc Pederson’s Ugly Second Half
For the first three months of last season, Joc Pederson looked like a future star. At the All-Star break, Pederson was hitting .230/.364/.487 and his 137 wRC+ placed him 12th among National League batters. In the last 20 years, the only players younger than Pederson to hit 20 home runs faster than Pederson (95 games) are Albert Pujols, Adam Dunn, Giancarlo Stanton, Carlos Correa, and Chris Davis, per Baseball-Reference’s Play Index. In the second half, however, things unfolded quite differently: Pederson recorded 219 terribly unproductive plate appearances, leading to questions about whether the league had figured Pederson out.
Pederson’s strikeouts rose as steadily as he did through the minors, topping out at 27% in his last Triple-A season in 2014 before he was promoted to the majors. The rise in strikeouts was accompanied by a a rise in walks and power, and that pattern continued in the first half of last season with a 16% walk rate and a 29% strikeout rate. Pederson’s first half surge did not last into the summer months, as both his BABIP (from .282 to .232) and ISO (from .257 to .122) plunged — although his walk and strikeout rates remained unchanged.
While it would be easy to point to Pederson’s BABIP decline and hope for a turnaround, there are too many other peripheral statistics that point to a general drop in Pederson’s ability last season. Pederson’s line-drive rate dropped from 18% to 14% from the first half to the second half, his infield-fly percentage went from 10% to 23%, and his soft-contact percentage moved from 15% up to 29% in the second half. His exit velocity was 93.5 mph in the first half, ranking behind only Giancarlo Stanton, Yoenis Cespedes, Ryan Braun, Miguel Cabrera, and Jorge Soler among players with 100 at bats. In the second half, however, it dropped to 89.3 mph, per Baseball Savant.
