Padres Option Matt Waldron

The Padres optioned starter Matt Waldron to Triple-A El Paso. San Diego recalled reliever Logan Gillaspie to step into the bullpen before tonight’s series opener with the Mets.

Waldron, MLB’s lone knuckleballer, has held a rotation spot all year. He has made 26 starts and is second on the team behind Dylan Cease with 142 2/3 innings. His 4.79 ERA belies decent peripherals. Waldron has a roughly average 21.6% strikeout percentage and has kept his walk rate to a tidy 6.6% clip. Hitters have generally had a tough time making hard contact against him. An abnormally low 67.1% left on base rate is the biggest factor in Waldron allowing nearly five earned runs per nine. ERA estimators like FIP and SIERA suggest his peripherals should point to an ERA in the low-4.00s.

Things have gone downhill over Waldron’s last few starts. He carried a 3.71 ERA into the All-Star Break. He has given up exactly eight earned runs per nine innings in 36 frames during the second half. Waldron has surrendered five-plus runs in four of his last five starts. The Twins blitzed him for 12 hits and 10 runs in 4 1/3 innings last night.

Bob Nightengale of USA Today tweets that the assignment is about giving Waldron some rest before the stretch run. While it’s possible that fatigue has played a role in the righty’s recent struggles, Waldron isn’t too far beyond last year’s innings total. He combined for 133 2/3 frames between the majors and Triple-A a season ago. There seems to be something amiss with his recent skid, so the Padres will give him at least a couple weeks away from big league hitters. A pitcher cannot be recalled from an optional assignment for at least 15 days unless he’s replacing another pitcher who is going on the injured list.

San Diego doesn’t have an off day until September 3. They’ve got a handful of rest days built into their September schedule but will need a full rotation for the next two weeks. The Friars have Cease, Michael King, Joe Musgrove and Martín Pérez in their rotation for now. There’s still not much clarity on whether Yu Darvish will be able to return from the family matter to which he’s attending. Randy Vásquez is the top depth arm on the 40-man roster. He has a 4.63 ERA over 17 major league starts this year and has been hit extremely hard (8.78 ERA) in the Pacific Coast League.

The demotion shouldn’t have much impact on Waldron from a service time perspective. He entered the year with 54 days of MLB service and has already topped the necessary 118 days on the active roster to surpass the one-year service mark in 2024.