Last name is pronounced "oo-YOH-lah"...Miguel signed with the Astros as an 18-year-old international free agent out of the Dominican Republic in January 2021...is looking to join a long list of successful Astros starters who joined the organization past their initial international signing window at 16 years old, including Framber Valdez, Cristian Javier, Ronel Blanco and Luis Garcia...Ullola is a native of Puerto Plata, a major coastal city in the D.R. known for its beaches and resorts, with a population just over 160,000 as of 2022...Entering the 2026 season ranked as the No. 5 pitching prospect and No. 10 overall prospect in the Astros system by Baseball America...Miguel relies heavily on a fastball-slider mix, with his fastball sitting between 92-96 mph and peaking at 98 mph...his fastball is extra deceptive thanks to a flat approach angle coupled with superb carry...also works in a changeup and curveball in his arsenal...Ullola's older brother introduced him to the game at a young age...grew up idolizing Pedro Martinez, like many who grew up in the Dominican Republic...The 2026 season is Ullola's second at Major League Spring Training (2025)...is under a Major League contract for the upcoming season after being added to the 40-man roster on Nov. 18, 2025.
2025
Spent his first full season in the Triple A rotation in 2025 and went 7-6 with a 3.88 ERA in 28 appearances (23 starts)...despite not reaching qualified status, he ranked first in ERA (3.88), first in BAA (.183), first in strikeout percentage (26.6%), first in strikeout-per-nine (10.37), second in strikeouts (131) and fourth in WHIP among PCL starters with a minimum of 100 IP...won PCL Pitcher of the month for May after pitching to a 3-0 record in five starts with a 1.17 ERA (three ER/23 IP), 34 strikeouts and a .175 BAA.
2024
Was one of the most dominant starters in the Minors in 2024, ranking first among all MiLB pitchers with a .161 opponent batting average (min. 100 IP), while also ranking third with 171 strikeouts (130.1 IP)... Made all but one of his 28 appearances (24 starts) in the regular season with Double-A Corpus Christi, going 5- 9 with a 4.24 ERA (60 ER/127.1 IP) in his time with the Hooks...Set Corpus Christi's single-season record with 166 strikeouts...Made his Triple-A debut in his regular-season finale on Sept. 19, allowing two runs through three innings with five strikeouts in a start for the Space Cowboys...Went on to get the start in Game 2 of the Pacific Coast League Championship Series vs. Reno, tossing four scoreless innings while striking out five batters...At the time of his promotion to Triple-A, led the Texas League in opponent batting average (.162) and strikeouts (166), while ranking fourth in WHIP (1.14) and fifth in ERA (4.24)…Logged a career-high 12 strikeouts on May 10 vs. Amarillo.
2023
Spent the entire 2023 season with High A Asheville, going 3-9 with a 5.86 ERA (59ER/90.2IP) with 116 strikeouts in 25 games (13 starts)…ranked ninth in the South Atlantic League in strikeouts...went on to make seven relief appearances with the Mesa Solar Sox of the Arizona Fall League in the offseason.
2022
Worked all of 2022 with Low A Fayetteville and went 2-2 with a 3.25 ERA (26ER/72IP), 120 strikeouts and a .157 opponent batting average in 22 games (11 starts)…his .157 opponent batting average (39-for-249) was the lowest among Astros minor leaguers and the fourth-lowest among all MiLB pitchers (min. 70 IP)…also ranked fifth in the Carolina League and sixth among Astros minor leaguers in strikeouts... was on the Injured List from April 14-May 1.
2021
Made his professional debut in 2021, splitting time between the Astros Dominican Summer League (eight games) and Florida Complex League (two games) affiliates... went a combined 1-1 with a 4.07 ERA (11ER/24.1IP) and 38 strikeouts in 10 games (five starts).
