For Padres pitching prospect Peña, AFL excellence could put him on verge of MLB debut

Francis Peña is pitching so well for Peoria in the Arizona Fall League that he might have another destination on his mind soon: Petco Park.

Prior to Tuesday, the Padres’ right-handed relief prospect had yet to give up an earned run over seven games in the AFL. It wasn’t until his eighth outing, on Tuesday vs. Salt River, that he finally allowed runs (three, two earned). He has struck out eight of his 40 batters faced (20 percent) and walked only two over 10 1/3 innings.

It’s been a terrific autumn for a 25-year-old who was in the Fall League three years ago with different results: namely a 7.36 ERA and 1.77 WHIP over six appearances. After that 2023 fall, he climbed three levels in ’24 and returned to Triple-A El Paso for ’25, only to finish with a 4.99 ERA and a 19.8 percent K rate in 43 innings at the Minors’ top level. Peña dropped to Double-A San Antonio this summer and finished with a 3.05 ERA, 71 strikeouts and 36 walks across 59 frames in the Texas League -- better numbers that should be expected with a move down a level.

While the AFL results thus far have been encouraging on their face after the yo-yoing of the past two years, Peña has the stuff to match the numbers.

The 6-foot-1 right-hander has touched 99.3 mph with his sinker with Peoria this fall; only Jarlin Susana and Andy Rodriguez have thrown harder sinkers in the AFL in 2026. But it’s not just the heat (generally sitting 95-98) that makes it effective. Peña has averaged 7.2 feet of extension in the Fall League, putting him well above Major League average. Only Alek Jacob (7.3) got farther down the mound among Padres MLB pitchers this season. So the ball gets right on top of batters at the point of release, and with his back turned toward the batter at the start of his delivery, Peña adds some extra deception that can make the heater tough to pick up, leading to a 38 percent whiff rate.

It’s also a buzzsaw of a fastball with 12-15 inches of armside action and good sink. Fifteen of the 28 balls in play off Peña this fall have come on the ground for a ground-ball rate of 53.6 percent. He had a 59.2 percent mark for San Antonio during the regular season, his highest ground-ball rate over a full Minor League season yet. Furthering the argument of weak contact, batted balls against Peña this fall have averaged just 87.1 mph for exit velocity.

Luckily for him, that fits a recent pattern of a Padres bullpen that established itself as one of the best in baseball in 2026. San Diego relievers ranked third in the Majors with a collective 46.2 percent ground-ball rate this summer, trailing only the Tigers (46.9) and Giants (46.5). Even that said, Adrian Morejon, who is expected to generate tons of interest as a free agent this offseason, was the only one close to Peña’s Double-A or AFL marks at 58 percent over his 86 innings.

Peña also mixes in a 95-97 mph four-seamer for something with a bit more ride and a 90-92 mph cutter to get a pitch moving at least a little to the gloveside. But in general, all three of his main pitches are hard and don’t creep into negative induced vertical break territory.

Without an effective changeup or other weapon for opposite-bats, splits could be an issue for Peña regardless of how much heat and movement he brings to the table. Six of his eight hits allowed in this year’s Fall League have come against left-handed hitters, and at Double-A in the summer, lefties had a .762 OPS against the reliever compared to the .591 mark of righties.

Even so, this is a level of heat and ground-ball tendencies that can be hard to find in the modern game, where hitters are so consistently trained to lift the ball in the air. Peña was unprotected and unpicked when he was Rule 5-eligible last year, but with each passing Fall League outing, he looks to be nudging his chances for a possible 2027 debut up higher and higher.