Houston Astros’ Kai-Wei Teng Makes Season Debut as Starter Against Orioles

The Houston Astros will turn to right-handed reliever Kai-Wei Teng in an unconventional move, naming him the starter for Tuesday’s series opener against the Baltimore Orioles. The decision, announced by the team on Monday, reflects the Astros’ ongoing struggles to stabilize a rotation decimated by injuries while balancing the need for bullpen depth.

From Bullpen to Mound: Teng’s Role Shift

Teng, acquired from the San Francisco Giants in a January trade, has emerged as one of Houston’s most reliable arms this season—but not in the role he’ll assume on Tuesday. Through the first month of the 2026 campaign, Teng has been a standout reliever, posting a 2.16 ERA, and 0.90 WHIP across 16 ⅔ innings in 11 appearances. His effectiveness has made him a rare bright spot in an Astros bullpen that currently owns the worst ERA (6.31) and WHIP (1.70) in Major League Baseball.

The move to deploy Teng as a starter—officially listed as a “starter/opener”—marks his first such assignment with the Astros. While the designation suggests he may not pitch deep into the game, it underscores the team’s creative approach to managing a rotation in crisis. Entering Monday, Houston had already used 10 different starting pitchers in its first 30 games, a reflection of the injuries plaguing its staff.

Injury-Ravaged Rotation Forces Creative Solutions

The Astros’ rotation has been among the most unstable in the league this season. Four members of the team’s opening-day rotation—Hunter Brown, Cristian Javier, Tatsuya Imai, and fill-in Cody Bolton—are currently on the injured list, contributing to an MLB-high 15 players on the IL. The absences have left Houston with few options, as only four teams have received fewer innings from their starting pitchers this season.

Quality starts have been particularly scarce. Spencer Arrighetti’s seven-inning outing against the New York Yankees on Sunday marked just the fifth quality start for the Astros in their first 29 games—and only the second time a Houston starter has completed seven innings. The lack of length from the rotation has placed additional strain on the bullpen, which has logged the third-most relief innings in the majors and entered Monday with the highest ERA (6.31) in the league.

Teng’s transition to the rotation presents a calculated risk. While his relief performance has been stellar, his track record as a starter is mixed. In seven starts for the Giants last season, he compiled a 1-4 record with a 7.66 ERA over 24 ⅔ innings. His lone win came in a September outing against the Colorado Rockies, where he pitched 5 ⅓ innings and allowed two runs. In his other six starts, he failed to pitch more than four innings in any appearance.

Stuff and Strategy: What Teng Brings to the Mound

Despite his uneven starting history, Teng’s arsenal has drawn praise from the Astros’ coaching staff. He throws five pitches, with his slider, four-seam fastball, and sinker serving as his primary weapons. Notably, his velocity has improved this season, with his four-seam fastball averaging around 95 mph—up more than one mph from 2025—and his sinker sitting just over 94 mph.

“We’re always looking for ways to optimally use the pitchers we have on our staff. He certainly put himself in that conversation. He’s got really good stuff. He’s got dynamic weapons from both sides, and it should be a matter of finding a spot for him and stretching him out, if we choose to do that.”

Astros pitching coach Josh Miller

The Astros’ decision to deploy Teng as a starter appears to prioritize immediate needs over long-term role clarity. With the rotation in flux and the bullpen overworked, the team is betting that Teng’s stuff can translate to a starting role, even if only in a limited capacity. His ability to pitch multiple innings—he has already shown proficiency in long relief this season—may help alleviate some of the bullpen’s workload.

What’s Next for the Astros?

Tuesday’s start against the Orioles will be a critical test for Teng and the Astros’ pitching strategy. Baltimore, while not among the league’s elite offenses, presents a challenge for any pitcher, particularly one adjusting to a new role. If Teng can provide length and effectiveness, he could solidify a spot in the rotation, at least until the injured starters return.

For Houston, the move is less about finding a long-term solution and more about surviving a brutal stretch of injuries. With the team sitting at an AL-worst 11-18 record entering Monday, every decision carries heightened stakes. The Astros’ ability to navigate this pitching crisis could determine whether they remain in contention or fall further behind in a competitive American League.

Teng’s start will also be closely watched by fans and analysts alike, as it represents a microcosm of the Astros’ broader challenges. Can a reliever with elite stuff but limited starting experience step into the rotation and provide stability? The answer could shape the team’s trajectory for the remainder of the season.