The Incredible Platooning Jorge Polanco

Jorge Polanco has always been a good hitter. He has a career 111 wRC+, and since he started getting regular playing time in 2016, he’s finished with a wRC+ below 100 only three times, one of which was the pandemic-shortened 2020 season. But he’s played 20 games so far this season, and he’s never had a 20-game stretch quite like this. He’s batting .377 with a 233 wRC+. How is Polanco – while injured – running the fifth-best xwOBA in baseball and second-best overall batting line?
As I mentioned, Polanco isn’t 100%. He underwent surgery in October to repair his left patellar tendon, and soreness in that knee has already cost him a couple of games this season. Polanco has also been dealing with a minor oblique strain, which has kept him from hitting right-handed since March 31. Polanco has a career 118 wRC+ as a lefty and a 95 wRC+ as a righty. That’s a legitimate platoon split, but it’s not big enough that we should have expected him to turn into Babe Ruth once he quit batting right-handed. Moreover, you have to imagine that the injury is slowing him down at least slightly, even from the left side. Maybe I’m wrong here, but it’s just hard to believe that any baseball swing could be completely unaffected by an oblique injury.
Just to recap, Polanco has a minor injury. He’s only batting left-handed and (with the exception of one plate appearance that ended with a strikeout) only facing righties. He’s also DHing and getting days off to protect the oblique. Oh, and he’s been the best hitter in baseball (non-Aaron Judge division). So let’s figure out what’s going on. We’ll start with the basics. Here are Polanco’s numbers from each of the five most recent seasons. Read the rest of this entry »