OAKLAND -- It was the first Opening Day for the Angels without Mike Scioscia as manager since 1999, but it ended in a familiar result, as the regular-season opener hasn't been kind to the club in recent years, and the theme continued in a 4-0 loss to the A's on Thursday at the Oakland Coliseum.

The Angels have now lost six straight regular-season openers, including three in a row in Oakland. The offense was the culprit in the first game of the Brad Ausmus era, as the Angels managed just three hits in the defeat.

"Obviously, it's the first game so everyone was anxious to get out there," said Mike Trout, who went 1-for-3 with a walk in his first game since signing his 12-year, $426.5 million extension. "Good thing is we have a game tomorrow, too. We've just got to turn the page."

Offense doesn't figure to be the issue for the Angels this season, but they couldn't get anything going against veteran right-hander Mike Fiers, who entered with a 15.00 ERA after allowing five runs in three innings in a loss to the Mariners in the Japan Opening Series. Second baseman Tommy La Stella managed the only hit off Fiers, smacking a double over the head of center fielder Ramon Laureano in the fifth, as Laureano initially broke in on the play. Fiers threw six innings to get the win.

"Give Mike Fiers credit," Ausmus said. "He pitched very well. I thought we took some good swings on him that couldn't find grass. But he got through those and did an outstanding job for them."

The Angels saw a few of their potential rallies quelled by the defense of A's third baseman Matt Chapman, who snared a hard-hit liner from Jonathan Lucroy in the third and also made an athletic play on a grounder from Peter Bourjos with two on in the fifth that he turned into an inning-ending 5-3 double play.

"The double play certainly was a big play," Ausmus said. "There's a reason he won the Gold Glove. I think he won the Platinum Glove too. He's an excellent defender."

Right-hander Trevor Cahill, starting against his former club, went six innings for the Angels, allowing four runs on six hits, including two homers in his second career Opening Day start. Cahill didn't give up more than one homer in any of his 21 starts with the A's last year and hadn't surrendered two homers in a game since Sept. 25, 2017.

Cahill was hurt by extra-base hits, as he served up a triple off the wall to Jurickson Profar that led to a run in the second while also giving up an RBI double to Stephen Piscotty in the third with La Stella missing the tag on Piscotty.

Cahill also gave up solo blasts to Marcus Semien and Khris Davis.

"A couple bad pitches," Cahill said. "Got ahead of KD and I couldn’t put him away. Semien kept battling and put a good swing on one. Other than that, I felt OK. I just couldn’t put anybody away. I felt like I was getting ahead. But they did a good job battling and laying off some stuff."

The Angels didn't get their second hit until Kole Calhoun singled with two outs in the eighth off reliever Joakim Soria. Trout followed with a single and went to second on an error by Laureano but both runners were stranded in scoring position with Justin Bour popping out to end the frame.

Trout was looked at by trainers after sliding into second but said he suffered a scrape on his calf earlier in the game and said it was just his leg cramping up from wearing a protective pad.

He downplayed both the injury and the loss after the game.

"It's all good now, I'm fine." Trout said. "We're excited but obviously it didn't turn out to be the way we wanted today."