Waldron was recalled from Triple-A El Paso on Sunday.
Waldron will serve as fresh arm capable of logging multiple innings of relief Sunday following starter Martin Perez. Waldron, who is known best for his knuckleball, logged a 4.79 ERA, 1.24 WHIP and 130 strikeouts in 142.2 innings through 26 MLB starts this year.
The Padres optioned Waldron to Triple-A El Paso on Thursday, Dennis Lin of The Athletic reports.
Waldron has given up 22 earned runs across his last 14.1 innings spanning three starts, and now the Padres will try to get him back on track in the minors. It's unclear who will take over Waldron's spot in the rotation, though Randy Vasquez is on the same pitching schedule as Waldron and would be a natural fit to return from Triple-A to fill the opening.
Waldron (7-11) took the loss against Minnesota on Wednesday, allowing 10 runs on 12 hits and one walk while striking out three batters over 4.1 innings.
Waldron managed to get through two scoreless frames before being tagged for a run in the third. He then fell apart in the fourth, as the Twins pounded him for seven runs on seven hits, including two doubles and a homer. Waldron was allowed to return for the fifth frame but retired just one batter before he was pulled after giving up another run, and the final tally against him came after he departed. The knuckleballer has been knocked around in each of his past three starts, giving up a combined 22 runs over 14.1 frames. HIs season ERA has jumped from 3.79 ERA to 4.79.
