Athletics 2, Astros 0
OAKLAND, Calif. -- Jesse Hahn pitched 6 2/3 shutout innings in his first start with the Oakland Athletics and Billy Burns provided just enough offense to help the A's down the Houston Astros 2-0 on Saturday.
Josh Phegley and Marcus Semien each walked and had a hit for the A's, who won their fourth straight at home after opening the season 1-7 in the O.co Coliseum.
Hahn (1-0), who opened the season at Triple-A Nashville following a tough spring, showed he belonged as he allowed one baserunner to venture past first base. He gave up three hits, walked two and struck out four as the A's ended the month over .500 at 13-12.
John Axford went 1 1/3 scoreless innings and Ryan Madson worked the ninth for his eighth save in as many chances. The A's recorded their first shutout of the season and the Astros were shut out for the first time.
Chris Devenski (0-1) pitched effectively enough to win most games, hampered by a spell of wildness in one inning. He allowed two runs on five hits over five innings in his first major-league start.
Devenski walked three, all in one inning, and struck out four.
Carlos Correa doubled off the wall in the seventh, the hardest hit of the game for the Astros, who have lost seven of nine and ended April with a 7-17 mark.
Hahn retired 10 in a row at one point and left after walking Evan Gattis with two out in the seventh. He faced the minimum of 15 batters through the first five innings.
After Hahn walked George Springer in the first, he induced Carlos Correa to hit into a double play.
Preston Tucker singled to open the third before Luis Valbuena hit into a double play.
Of the first 15 outs recorded by Hahn, 13 were recorded on grounders, a clear sign that his sinker was effective.
Devenski, meanwhile, showed signs of being an efficient starter for the Astros and also struggled at times.
After striking out Chris Coughlan and retiring Coco Crisp on a weak comebacker, Devenski gave up a double to Friday night's hero Yonder Alfonso and walked No. 8 and No. 9 hitters Josh Phelgley and Marcus Semien ahead of Burns' two-run single.
In the fourth, the A's had runners on first and third with one out before Devenski got Burns on a short fly ball and Jed Lowrie on a grounder.
NOTES: A's RHP Chris Bassitt has a partial UCL tear in his right elbow, which was revealed by a MRI exam performed Friday. The diagnosis could lead to season-ending surgery. Bassitt is going to Cincinnati for a second opinion. ... RHP Andrew Triggs was optioned to Triple-A Nashville to make room for RHP Jesse Hahn. Triggs spent one day with the A's and did not pitch. ... INF Danny Valencia (hamstring) is on track to rejoin the A's when they head to Baltimore to open a series on Friday, May 6. He's expected to make three rehab starts this week. ... INF Eric Sogard (sore neck) is continuing his rehab. ... Astros OF Carlos Gomez will miss a couple of days because of a sore left ribcage. He sustained the injury diving for a ball Friday night. Gomez left Wednesday's game in Seattle early when he was hit by a pitch on his right hand. ... RHP Ken Giles, while never officially announced as the Astros set-up man, will not necessarily get the ball in the eighth inning for the time being. "I want to give him a physical and mental break," Astros manager A.J. Hinch said a day after Giles recorded his first blown save of the season. He's 0-2 with a 9.00 ERA this season, although he's 9-6 with a 2.15 ERA over 124 career relief appearances. ... RHP Chris Devenski was the first Astros pitcher this season to make his first major-league start. RHP Nick Tropeano was the last to win in his starting debut in 2014.