Houston Astros pitching prospect Miguel Ullola owns the second-highest walk rate in Triple-A at 15.8 percent, but has limited damage otherwise and holds a 3.80 ERA in 64 innings as we head into the second half. Ullola's command ails him fairly often, as he has allowed four or more walks in five of his 16 starts this season. He has great stuff, which has led to a strong 27.4 percent strikeout rate, but the walk rate is untenable. In addition, he doesn't combat the free passes with a high ground ball rate at just 36.3 percent. The right-hander has previously shown better ground ball rates at other levels of the minor leagues, and that could be a key piece for him. He likely projects as a reliever in the major leagues and could develop into a solid one with Houston's track record.

Houston Astros pitching prospect Miguel Ullola allowed one run on four hits and two walks across five innings. He picked up the win and struck out five. The 22-year-old has put together a pristine month of May with a 1.17 ERA, 1.17 WHIP, and 34:13 K:BB in 23 innings. He will continue to battle with his control, but he has also posted big-time strikeout numbers this season. His control issues may eventually land him in a bullpen role, but the Astros' top pitching prospect could have an opportunity at some point with the big league club, given all their injuries.

Houston Astros right-handed pitching prospect Miguel Ullola struck out 10 batters during Thursday's start against Triple-A Salt Lake. In this outing, Ullola allowed just one hit and one walk. He did not allow a run. Since allowing 10 runs over his first 10 innings of the Triple-A campaign, Ullola has flipped the script. Over his last two starts (10 innings), the No. 6-ranked prospect in the Houston system struck out 15 batters and has allowed just two hits, three walks, and no runs. Last summer, the 22-year-old spent most of his time with Double-A, where he logged 127 1/3 innings of work to the tune of a 4.24 ERA with a 1.14 WHIP. Given his steady improvements, Ullola should be in the mix to join Houston later this season.

Houston Astros pitching prospect Miguel Ullola (shoulder) exited Friday's Spring Breakout contest early due to right shoulder discomfort. Fantasy managers should continue to monitor his status as the team will likely provide an update in the coming days. However, seeing him have soreness in his throwing arm is not a positive sign. Last season, the 22-year-old began the campaign by making his 2024 debut. He tossed 127 1/3 innings to the tune of a 4.24 ERA and a 1.14 WHIP. He tallied 166 punchouts but served up a high 73 free passes. He then earned a brief taste of Triple-A, where he logged just three innings. When he is cleared to return to action, fantasy managers should expect Ullola to continue his progression at Triple-A. If he does not miss much time, he could push for an MLB debut in the second half of the season.