Scott Feldman pitched two scoreless innings in his first spring start for Houston, allowing only one hit in the Astros' 5-1 loss to the Detroit Tigers on Saturday.
Austin Jackson had two hits for Detroit, which scored all five runs in the fourth inning.
Feldman signed a three-year, $30 million contract with the Astros in the offseason, and Houston hopes the 31-year-old right-hander can provide stability at the top of the rotation. Feldman went 12-12 with a 3.86 ERA last year while splitting time between the Chicago Cubs and Baltimore Orioles.
He allowed a walk to Miguel Cabrera and a single to Jackson on Saturday.
Cabrera's single started Detroit's fourth-inning rally, which also included a two-run double by Don Kelly.