ARLINGTON, Texas (AP) -- After Oakland took the lead with a six-run seventh inning, the Athletics' bullpen couldn't hold on to it.
Shin-Soo Choo hit a tying three-run homer in the bottom of the seventh and scored the winning run in the 10th to lift the Texas Rangers to an 8-7 victory over the A's.
Six Oakland relievers allowed five runs on six hits and four walks over 3 2-3 innings. Choo led off the 10th with a double down the right-field line against Ryan Cook (0-2), moved to third following two walks and scored on Rougned Odor's single off R.J. Alvarez.
"We're just struggling in the bullpen," A's manager Bob Melvin said. "At the end of the day, we had a 7-3 lead, and we couldn't hold it."
Josh Reddick had three hits to extend his career-high hitting streak to 10 games during which he's hitting .500. His three-run home run with two out in top of the seventh capped a six-run rally that put the A's ahead 7-3.
"I just try to go out there and lead with my bat and produce that way," Reddick said. "We seem to be scoring in big bunches in one inning, and you can't really complain about that."
Rookie Keone Kela (1-1) pitched the top of the 10th to earn his first major league win as the Rangers ended a four-game losing streak.
Three batters into the Athletics' six-run seventh, Mark Canha lined a ball past the mound that struck crew-chief Jerry Meals, who was standing to the right of second base on the infield grass, on the left hip. What looked like a double-play opportunity instead left the bases loaded with no one out.
"I'm guessing that nobody feels worse than Jerry in that type of situation," Rangers manager Jeff Banister said.
Oakland's runs that inning came on three hits, two errors and a hit batter. One of the errors was committed by catcher Robinson Chirinos. He had Canha in a rundown but threw over third baseman Adrian Beltre into left field.
Alvarez and outfielder Billy Burns were recalled Saturday from Triple-A Nashville, which is playing three hours south of the Dallas-Fort Worth area in the Austin suburb of Round Rock. Burns led off and had two hits.
OF Coco Crisp was scheduled to take a field trip Saturday night after taking afternoon batting practice as part of injury-rehab assignment with Class A Stockton. The destination - the Mayweather-Pacquiao fight in Las Vegas. Crisp is scheduled to play for Stockton on Sunday and Monday and could return to Oakland's lineup midweek.
MOVING DAY FOR A'S
In addition to welcoming Alvarez and Burns, the A's acquired OF Alex Hassan from Texas. To make room for him, OF Cody Ross was designated for assignment. Ross appeared in eight games and hit .095.
Athletics: LHP Eric O'Flaherty was placed on the 15-day disabled list with shoulder soreness and returned to the Bay Area to see team doctors. "Gave him some time off, hopefully gave him enough time for it to go away and it did," Melvin said. "So, we have to give him some rest."
Athletics: RHP Sonny Gray (3-0) limited the Rangers to one hit over eight innings in Oakland's 8-0 win on opening day.
Rangers: RHP Yovani Gallardo (2-3), who opposed Gray in the season-opener, has not pitched more than six innings in five starts.