Jason Castro homered in his first start back with Houston, and the Astros beat the Oakland Athletics 9-2 on Sunday for a four-game sweep.

Dusty Baker tied Bill McKechnie for 14th among managers with 1,896 wins.

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Houston Astros' Chas McCormick (6) smiles after hitting a three-run home run that scored Jason Castro (18) and Myles Straw (3) against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Jason Castro homered in his first start back with Houston, and the Astros beat the Oakland Athletics 9-2 on Sunday for a four-game sweep.

Houston Astros' Chas McCormick (6) is congratulated by teammates after hitting a three-run home run against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston outscored the A's 35-9 in the series with 47 hits, including eight home runs. The Astros became the fourth team in major league history to score eight or more runs in each of its first four games.

Houston Astros' Yordan Alvarez, left, scores past Oakland Athletics catcher Aramis Garcia during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Mark Canha doubled, tripled and scored twice for the A’s, who are 0-4 for their first time since losing five straight at the start of 1987.

Oakland Athletics center fielder Mark Canha, left, cannot catch a two-run double hit by Houston Astros' Yuli Gurriel during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. Also pictured is Athletics right fielder Stephen Piscotty (25). (AP PhotoJeff Chiu)

Tucker homered off Manaea in the first.

Houston Astros' Jason Castro, top, rounds the bases after hitting a two-run home run off Oakland Athletics pitcher Sean Manaea, bottom, during the second inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Manaea (0-1) gave up five runs, six hits and three walks in 4 2/3 innings.

Kyle Tucker and Chas McCormick also homered for the Astros, off to their best start since 2001. Yuli Gurriel had three hits and two RBIs.

Houston Astros' Chas McCormick (6) smiles after hitting a three-run home run that scored Jason Castro (18) and Myles Straw (3) against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston Astros' Chas McCormick (6) smiles after hitting a three-run home run that scored Jason Castro (18) and Myles Straw (3) against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston outscored the A's 35-9 in the series with 47 hits, including eight home runs. The Astros became the fourth team in major league history to score eight or more runs in each of its first four games.

Sweeping the division rival A’s was especially pleasing to the Astros, who were taunted at the Coliseum throughout the series. Houston faces the fallout from the sign-stealing scandal in which Major League Baseball penalized the team ahead of the 2020 season, which was played in empty ballparks due to the pandemic.

Oakland won seven of the 10 games with Houston in 2020 on the way to its first AL West title since 2013.

Houston Astros' Chas McCormick (6) is congratulated by teammates after hitting a three-run home run against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston Astros' Chas McCormick (6) is congratulated by teammates after hitting a three-run home run against the Oakland Athletics during the sixth inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Mark Canha doubled, tripled and scored twice for the A’s, who are 0-4 for their first time since losing five straight at the start of 1987.

Castro was back in the Astros lineup for the first time since leaving Houston as a free agent following the 2016 season. Third on the franchise’s list for games caught entering the year, the 33-year-old Castro is slated for a backup role this season and is likely to share time with Martín Maldonado.

Castro’s home run off Sean Manaea (0-1) in the second came after Myles Straw drew a two-out walk.

Houston Astros' Yordan Alvarez, left, scores past Oakland Athletics catcher Aramis Garcia during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston Astros' Yordan Alvarez, left, scores past Oakland Athletics catcher Aramis Garcia during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Tucker homered off Manaea in the first.

McCormick added a three-run drive off Yusmeiro Petit in the sixth.

Brandon Bielak (1-0) pitched 4 2/3 hitless innings of relief with four strikeouts and no walks.

Astros starter José Urquidy struck out five in 4 1/3 innings, allowing two runs and four hit.

Oakland Athletics center fielder Mark Canha, left, cannot catch a two-run double hit by Houston Astros' Yuli Gurriel during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. Also pictured is Athletics right fielder Stephen Piscotty (25). (AP PhotoJeff Chiu)

Oakland Athletics center fielder Mark Canha, left, cannot catch a two-run double hit by Houston Astros' Yuli Gurriel during the third inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. Also pictured is Athletics right fielder Stephen Piscotty (25). (AP PhotoJeff Chiu)

Manaea (0-1) gave up five runs, six hits and three walks in 4 2/3 innings.

Oakland was held to four hits.

ROOKIE MAKES MOUND DEBUT

Oakland rookie Ka’ai Tom pitched a scoreless ninth inning — after starting the game in left field. Tom retired Jose Altuve and Tucker on infield pop-ups before Alex Bregman reached on an infield single. Yordan Alvarez then grounded out.

Houston Astros' Jason Castro, top, rounds the bases after hitting a two-run home run off Oakland Athletics pitcher Sean Manaea, bottom, during the second inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

Houston Astros' Jason Castro, top, rounds the bases after hitting a two-run home run off Oakland Athletics pitcher Sean Manaea, bottom, during the second inning of a baseball game in Oakland, Calif., Sunday, April 4, 2021. (AP PhotoJeff Chiu)

TRAINERS ROOM

Astros: OF Michael Brantley showed improvement a day after getting hit in the right wrist by a 90 mph fastball, and manager Dusty Baker is cautiously optimistic. “When he’s coming back just depends on his body and how he heals,” Baker said. “We dodged a major bullet by him having no fractures or a broken wrist or anything like that.”

Athletics: RF Chad Pinder was taken out not long after making a leaping catch and crashing hard into the fence on Altuve’s deep fly leading off the game. Pinder also made a pair of spectacular catches on opening night. … Sean Murphy (wrist bruise) felt discomfort hitting in the cage before the game and remains out. … Ramon Laureano (sore wrist) is feeling better but was held out.

UP NEXT

Astros: RHP Luis Garcia (0-1, 2.92 ERA in 2020) makes his second career start in the first of a two-game series at Anaheim on Monday.

Athletics: Frankie Montas (3-5, 5.60 ERA in 2020) makes his season debut at home against the Dodgers on Monday. Montas hasn’t pitched since coming out of his final spring training start because of a cuticle tear on his right middle finger.

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