The Astros optioned Ullola to Triple-A Sugar Land on Wednesday, Matt Kawahara of the Houston Chronicle reports.
The righty reliever will head back to Triple-A as the Astros open up room on the active roster for right-hander Ethan Pecko, who was called up from Sugar Land ahead of his scheduled start Wednesday versus the Angels. Ullola has surrendered three runs on four hits and one walk with nine strikeouts across six innings with Houston this season.
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Astros' Miguel Ullola: Back in minors
Rotowire
The Astros optioned Ullola to Triple-A Sugar Land on Wednesday.
Ullola gave up three earned runs in just one inning after getting called up Sunday, and he'll now lose his spot in the Astros' bullpen in order to make room for Hayden Wesneski's (elbow) return from the IL. Ullola owns a 4.92 ERA and 1.40 WHIP through 53 innings at Sugar Land and could make a few more appearances for Houston down the stretch as a replacement for a tired arm.
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Astros' Miguel Ullola: Impresses in debut
Rotowire
Ullola pitched two scoreless innings in Monday's loss against the Twins, allowing two hits while striking out four.
It was an impressive major-league debut from the 24-year-old Ullola, who relied heavily on his fastball that averaged 95.2 MPH. After shifting to a relief role earlier this year, Ullola posted a 2.70 ERA with 16 strikeouts across 10 innings with Triple-A Sugar Land. Ullola should continue to work in lower-leverage spots for the time being, though his strikeout rate does afford him some intrigue as a late-inning prospect.
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Astros' Miguel Ullola: Called up Sunday
Rotowire
The Astros recalled Ullola from Triple-A Sugar Land on Sunday, Chandler Rome of The Athletic reports.
The 24-year-old right-hander has yet to make his big-league debut, but he'll provide the Astros with a fresh bullpen arm ahead of Sunday's series finale in Detroit. Since signing with the Astros out of the Dominican Republic in 2021, Ullola has largely served as a starter during his time on the minors, but he was moved to the bullpen at Sugar Land in late May and has produced a 2.70 ERA, 1.40 WHIP and 16:6 K:BB in 10 innings across 10 relief appearances.
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Astros' Miguel Ullola: Dropped from big-league camp
Rotowire
The Astros optioned Ullola to minor-league camp Thursday, Brian McTaggart of MLB.com reports.
Ullola was added to the 40-man roster this offseason, but he was always destined for Triple-A Sugar Land to begin the season. The right-hander should open 2026 in Sugar Land's rotation, but a career 15.6 percent walk rate in the minors could point to an eventual move to the bullpen if he can't harness his control.
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Astros' Miguel Ullola: Joins 40-man roster
Rotowire
The Astros selected Ullola's contract from Triple-A Sugar Land on Tuesday.
The move adds Ullola to the 40-man roster and protects him from next month's Rule 5 Draft. Ullola spent the entirety of the 2025 campaign at Sugar Land, finishing with a 3.88 ERA and 131:78 K:BB over 113.2 innings. The 23-year-old will compete for an Opening Day roster spot, but a career 15.6 percent walk rate in the minors suggests more seasoning is needed.
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Astros' Miguel Ullola: Healthy at Triple-A
Rotowire
Ullola has a 2.08 ERA, 0.69 WHIP and 5:1 K:BB in 4.1 innings through two starts for Triple-A Sugar Land.
Ullola was removed from his Spring Breakout appearance in mid-March with right shoulder discomfort. He made his first start for the Space Cowboys April 8 and stayed on turn for an April 13 start, although he is slowly building back up from a workload standpoint.
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Astros' Miguel Ullola: Dealing with sore shoulder
Rotowire
Ullola was removed from Friday's Spring Breakout game appearance versus the Nationals due to right shoulder discomfort, Chandler Rome of The Athletic reports.
Any type of shoulder injury is worrisome, but it's unclear at this point how much time Ullola might miss. The 22-year-old finished last season at Triple-A Sugar Land and, once healthy, will head back there to begin the 2025 campaign.
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Astros' Miguel Ullola: Exits appearance with injury
Rotowire
Ullola was removed from Friday's Spring Breakout game appearance versus the Nationals with an apparent injury, Chandler Rome of The Athletic reports.
Ullola was in his second inning of work when he was visited by a trainer following a strikeout, eventually walking off the mound. The Astros have yet to provide any concrete information about the right-hander's condition.
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Astros' Miguel Ullola: Strong summer at Double-A
Rotowire
Ullola has a 3.88 ERA, 1.12 WHIP, and a 67:29 K:BB in 58 innings over his last 12 outings for Double-A Corpus Christi.
The hard-throwing righty has a 4.49 ERA for the year, but he's been more consistent since the calendar turned to June. Ullola's 13.5 percent walk rate on the year is his best mark to date, so he still needs to improve his control to make it as a starter at the highest level, but things are trending up. He sits at a career-high 106.1 innings on the season, which is another key datapoint for the 22-year-old. He will likely be added to the 40-man roster this offseason to protect him from the Rule 5 draft.
