Matt Waldron and His Knuckleball Are Sticking Around

When Matt Waldron made his major league debut for the Padres last June 24, it was a noteworthy event. While a few position players had thrown the occasional knuckleball ast a goof after taking the mound for mop-up duty, no true pitcher had thrown one in a regular season game in two years. The last one who had done so, the Orioles’ Mickey Jannis, made just one major league appearance. Mixing his knuckler in with four other offerings, Waldron bounced between the minors and majors for a couple months before sticking around in September. Now he’s a regular part of the Padres’ rotation, and he’s having success… some of the time.
Through six starts totaling 31 innings this season, Waldron owns a 4.35 ERA (111 ERA-) and 4.06 FIP (103 FIP-), which won’t put him in contention for the Cy Young award but is respectable enough to keep him occupying a back-of-the-rotation spot. For what it’s worth, within the Padres’ rotation he’s handily outpitched both Michael King (5.00 ERA, 6.30 FIP), whom the Padres acquired from the Yankees as one of the key pieces in the Juan Soto trade, and Joe Musgrove (6.94 ERA, 6.59 FIP), who last year signed a $100 million extension.
Waldron is striking out a modest 19.7% of hitters but walking just 7.3%; his 12.4% strikeout-walk differential is second best among Padres starters behind only Dylan Cease’s 18.7%, and Waldron’s 1.16 homers per nine sits in the middle of the pack among their starting five (which also includes Yu Darvish) — and a vast improvement on his 1.67 allowed per nine at Triple-A El Paso in 2022–23. He’s done a very good job of limiting hard contact, with his 87 mph average exit velocity placing in the 78th percentile and his 33.3% hard-hit rate in the 75th percentile. Read the rest of this entry »