Bellozo signed with the Houston Astros as an international free agent on July 3, 2017.[1] He made his professional debut in 2018 with the Dominican Summer League Astros, posting a 1.74 ERA with 42 strikeouts over 14 appearances.[2] Bellozo split the 2019 campaign between the Low–A Tri-City ValleyCats and Single–A Quad Cities River Bandits. In 14 appearances between the two affiliates, he accumulated a 6–1 record and 1.70 ERA with 69 strikeouts across 58+1⁄3 innings pitched.[3]
Bellozo did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[4] He missed the entirety of the 2021 campaign as well, due to an undisclosed injury.[5] Bellozo returned to action in 2022, making 10 appearances (5 starts) for the Single–A Fayetteville Woodpeckers and recording a 1.73 ERA with 43 strikeouts.[6]
Bellozo split the 2023 season between the High–A Asheville Tourists and Double–A Corpus Christi Hooks. In 26 total games (16 starts), he compiled a cumulative 5.55 ERA with 106 strikeouts and 4 saves across 110+1⁄3 innings of work.[7]