The Phillies Have Their Ace Back
A year ago, Aaron Nola was one of the best pitchers in baseball. His 3.01 FIP was very good, his 2.37 ERA was even better, and his 5.4 WAR was fourth in the National League and helped him to a third-place finish in the Cy Young voting. After four starts this season, Nola pitched like one of the worst pitchers in baseball with a 6.25 FIP, a 7.45 ERA, an ugly 13% walk rate, and a -0.2 WAR that ranked 74th out of 77 qualified pitchers. At that time, Dan Szymborksi diagnosed Nola’s issue with walks and homers and noted the following:
At least in the early going, batters seem to simply be taking a more passive approach to Nola after his breakout 2018 season, and he hasn’t adjusted. And he’s getting away from some of the things that he did successfully in 2018, such as daring to throw curves to lefties when behind in the count (he’s dropped from 39% to 20%). Batters are more patient and Nola’s been more predictable.
Since that time, Nola has essentially returned to form. He had one more bad start where he gave up two homers but encouragingly struck out nine batters against one walk. Since that start, Nola has taken the mound nine times and his FIP has been 3.30, a 76 FIP- in this run-scoring environment and very close to the 73 he’s put up over the last three years. His ERA is a very good 3.48, and though his walk rate is slightly elevated at 10%, his 26% strikeout rate is right in line with last season. In his piece, Szymborski produced a table showing the cause of Nola’s high walk rates. Batters weren’t chasing pitches they used to and they were making contact when they did. Here’s the bulk of that table, with Nola’s work through the time of Dan’s piece on April 18 and since then.
| Year | K% | BB% | O-Swing% | Z-Swing% | Swing% | O-Contact% | Zone% | F-Strike% | SwStr% |
|---|---|---|---|---|---|---|---|---|---|
| 2016 | 25.1% | 6.0% | 29.5% | 55.7% | 42.2% | 61.5% | 48.3% | 60.7% | 9.6% |
| 2017 | 26.6% | 7.1% | 29.4% | 60.8% | 44.5% | 59.3% | 48.2% | 64.4% | 10.8% |
| 2018 | 27.0% | 7.0% | 33.2% | 64.2% | 47.0% | 60.9% | 44.7% | 69.4% | 12.4% |
| Thru 4/15/19 | 21.8% | 12.6% | 25.5% | 55.4% | 38.4% | 70.0% | 43.0% | 48.3% | 8.4% |
| Since 4/15/19 | 26.8% | 9.2% | 30.3% | 57.0% | 41.1% | 61.8% | 40.4% | 62.4% | 9.2% |
Nola isn’t quite repeating what he did a year ago, but he’s not too far off either. He’s throwing fewer pitches in the strike zone and he’s not getting as many swinging strikes, which is something of an issue, but when hitters swing at pitches outside the zone, they are whiffing like they used to. Getting a lot more first strikes is a good thing for Nola, but even better, he’s actually finishing off batters once he gets that first strike. Read the rest of this entry »

Jay Jaffe