LOS ANGELES — The Los Angeles Dodgers suffered their worst loss ever in Dodger Stadium, an 18-1 blowout at the hands of the Houston Astros on Friday night in the series opener of a matchup between division leaders.

The 17-run loss marked the Dodgers’ largest margin of defeat at home since the team moved to Dodger Stadium in 1962, and the franchise’s worst home loss since July 3, 1947, when Brooklyn lost 19-2 to the New York Giants.

Jose Altuve homered twice while reaching base five times and driving in five runs for the Astros, who held the defending World Series champion Dodgers to six hits including Will Smith‘s solo homer.

“That was one you want to flush as soon as possible,” Dodgers manager Dave Roberts said. “I don’t think there were many positives from this night.”

Dodgers fans relentlessly booed Altuve throughout his at-bats, chanting, “Cheater! Cheater!” He’s one of two players, along with Lance McCullers Jr., remaining from Houston’s 2017 team that beat the Dodgers in the World Series. It later came out that the Astros were stealing signs with the help of video and relaying pitches to batters by banging on a trash can.

The AL West-leading Astros scored 10 runs in the sixth, highlighted by Victor Caratini‘s grand slam and Altuve’s three-run shot. It was the most runs given up in an inning by the Dodgers since April 23, 1999, when they allowed 11 to St. Louis.

McCullers (2-3) allowed one run and four hits in six innings of his second start since returning from a sprained right foot. He struck out four.

Isaac Paredes hit his first career leadoff homer on the first pitch of the game from rookie Ben Casparius. Altuve doubled and scored on Christian Walker‘s RBI single for a 2-0 lead.

Jake Meyers doubled leading off the third and scored on Altuve’s 14th homer. Rookie Cam Smith doubled and scored on Walker’s 417-foot shot halfway up the left-field pavilion to cap four straight hits given up by Casparius and extend Houston’s lead to 6-1.

“I don’t think Ben was good tonight,” Roberts said. “It seemed like they were on everything he threw up there.”

The Astros broke it open in the sixth. Smith had a bases-loaded RBI single, reliever Noah Davis hit Walker with two strikes on him to force in a run and Caratini hit his slam with no outs. Meyers added an RBI single, and Altuve hit his second homer of the night.

Casparius allowed six runs and nine hits in three innings and struck out three.

The Associated Press contributed to this report.

PHILADELPHIA — Mick Abel couldn’t sustain his sublime major league debut and is headed to the minors.

Taijuan Walker is back in Philadelphia’s rotation. And anticipation that prized prospect Andrew Painter could be headed to the Phillies will stretch past the All-Star break.

Zack Wheeler, Ranger Suárez and Cristopher Sánchez are about the only sure things this year in Philadelphia’s rotation.

The Phillies demoted Abel, the rookie right-hander who has struggled since he struck out nine in his major league debut, to Triple-A Lehigh Valley. The Phillies also recalled reliever Seth Johnson from Lehigh Valley ahead of Friday’s loss to Cincinnati.

The 23-year-old Abel made six starts for the Phillies and went 2-2 with 5.04 ERA with 21 strikeouts and nine walks.

“Mick needed to go down and breathe a little bit,” manager Rob Thomson said. “Just get a little reset. It’s not uncommon.”

A 6-foot-5 right-hander selected 15th overall by the Phillies in the 2020 amateur draft, Abel dazzled against Pittsburgh in May when his nine strikeouts tied a Phillies high for a debut, set by Curt Simmons against the New York Giants on Sept. 28, 1947.

Abel hasn’t pitched beyond the fifth inning in any of his last four starts and was rocked for five runs in 1⅔ innings Wednesday against San Diego.

Abel was 3-12 with a 6.46 ERA last year for Lehigh Valley, walking 78 in 108⅔ innings. He improved to 5-2 with a 2.53 ERA in eight minor league starts this year, walking 19 in 46⅓ innings.

“This guy’s had a really good year,” Thomson said. “His poise, his composure is outstanding. He’s really grown. We just need to get back to that. Just attack the zone and get through adversity.”

The Phillies will give Walker another start in Abel’s place against San Francisco. Walker has bounced between the rotation and the bullpen over the past two seasons. He has made eight starts with 11 relief appearances this season and is 3-5 with one save and a 3.64 ERA.

Thomson had said he wanted to give Walker an extended look in the bullpen. Abel’s struggles instead forced Walker — in the third year of a four-year, $72-million contract — back to the rotation. For now.

“He always considers himself a starter and ultimately wants to start,” Thomson said. “He’ll do anything for the ballclub, because he’s that type of guy, but I think he’s generally happy he’s going to go back into a normal routine, normal for him, anyway.”

Wheeler, Suárez and Sánchez have been lights-out in the rotation this year and helped lead the Phillies into first place in the NL East. Jesús Luzardo was a pleasant early season surprise but has struggled over the past two months and gave up six runs in two-plus innings in Friday’s 9-6 loss to the Reds.

“I still have all the confidence in the world in Luzardo,” Thomson said. “Everybody’s going to have bad outings here and there. I think we’re still fine.”

Thomson said he had not made a final decision on who will be the fifth starter after the All-Star break. Painter has two more scheduled starts in Triple-A before the MLB All-Star break and could earn a spot in the rotation. The 22-year-old will not pitch in the All-Star Futures Game as part of the plan to keep him on a hopeful path to the rotation.

Painter hurt an elbow during spring training in 2023 and had Tommy John surgery later that year. He was the 13th overall pick in the 2021 amateur draft and signed for a $3.9 million bonus.

Because of the All-Star break and a quirk in the schedule that has them off on all five Thursdays in July, the Phillies won’t even need a fifth starter after next week until July 22.

Aaron Nola could be back by August as he works his way back from a rib injury. Nola will spend the All-Star break rehabbing in Florida and needs one or two minor league starts before he can rejoin the rotation.

CHICAGO — Chicago Cubs righty Jameson Taillon was placed on the injured list on Friday with a right calf strain, the team announced before its game against the St. Louis Cardinals. He’s expected to miss “more than a month,” according to manager Craig Counsell.

Taillon, 33, injured his calf on his last wind sprint after a bullpen session on Thursday.

“He’s going to miss a pretty significant amount of time,” Counsell said.

Taillon was 7-6 with a 4.44 ERA in 17 starts for the Cubs this season who just got lefty Shota Imanaga back from a hamstring injury. Now they’ll have to navigate at least the rest of this month without one of their other key starters.

“There’s a little room for us to be flexible right now,” Counsell said citing the upcoming All-Star break. “We’ll use that to our advantage and we’ll go from there.”

The team recalled left-hander Jordan Wicks to take Taillon’s spot on the roster, though he won’t go directly into the rotation. Instead, the Cubs will throw a bullpen game on Saturday against the Cardinals and “go from there,” according to Counsell.

Wicks, 25, went 1-3 with one save, a 4.06 ERA and 46 strikeouts in 12 appearances (11 starts) with Triple-A Iowa this season. In his past five starts dating to May 18, he posted a 1.65 ERA with 20 strikeouts, compared to just three walks, a 0.86 WHIP and a .186 opponent batting average.

The team might also consider a bigger role for righty Chris Flexen who has been fantastic for them out of the bullpen. Flexen, 31, has a 0.62 ERA in 16 games, including a four inning stint late last month.

“He’s a candidate to be stretched out for sure,” Counsell said. “He’s prepared to do a little bit more.”

Cubs brass have already stated they are looking for starting pitching before the trade deadline later this month. Counsell was asked if Taillon’s injury increases that need. He didn’t take the bait.

“The trade deadline isn’t until July 31,” he said. “I’m focused on the next week or 10 games before the All-Star break.”