Seung Hwan Oh Has Been Completely Unhittable
Seung Hwan Oh has faced 25 batters this season, and thus, 25 batters in his major league career. There. You can’t say I didn’t warn you about sample sizes limitations. But sometimes, a number just sticks out at you, and you can’t ignore it. Sometimes, a number is separated so far from the pack that even when you consider the limited sample and factor in the expected regression, it still means something. Sometimes, that number looks like this:

| Name | O-Contact% | Z-Contact% | Contact% |
| Seung Hwan Oh | 45.0% | 38.7% | 41.2% |
| Craig Kimbrel | 42.9% | 69.6% | 59.5% |
| Ken Giles | 33.3% | 79.3% | 60.0% |
| Luke Hochevar | 38.5% | 75.0% | 60.6% |
| Vincent Velasquez | 53.3% | 66.7% | 62.6% |
| Dellin Betances | 52.2% | 73.9% | 63.0% |
| Drew Pomeranz | 32.3% | 81.1% | 63.1% |
| Jose Fernandez | 44.8% | 73.6% | 63.4% |
| Sean Doolittle | 60.0% | 64.5% | 63.4% |
| Darren O’Day | 43.5% | 79.3% | 63.5% |
-O-Contact = contact rate outside the zone
-Z-Contact = contact rate inside the zone
Blink, rub your eyes, do whatever you need to do, and then look at that last column again. More than half of all swings offered against Oh pitches this year have resulted in whiffs. He’s got nearly a 20 percentage point lead over Craig Kimbrel and Ken Giles. Look at that rate of contact inside the zone. Look at it! Oh has gotten whiffs at would-be strikes like Francisco Liriano has gotten whiffs at would-be balls. He’s been completely untouchable. Through 25 batters faced.
The lowest single-season contact rate ever allowed by a qualified reliever was 56% by Aroldis Chapman, in 2014. Both Chapman and Andrew Miller checked in below 60% last year. Oh clearly won’t stay near where he is, and he might not even stay near where Kimbrel is, but his first handful of big league appearances have been about as meaningful as they possibly could be, and I think I’m already comfortable saying that, at the very least, Oh isn’t going to be an easy at-bat for anyone. It seems like the Cardinals have found themselves a real weapon. The question is, just how strong is that weapon?


