Red Sox manager John Farrell says that Alfredo Aceves has been invaluable this season transitioning from the bullpen to the rotation.
Aceves will make his third start on Tuesday in the second of a three-game series against the Athletics at Fenway Park. The right-hander has filled in nicely for John Lackey, who is nearing a return from the disabled list.
Although Aceves is not among the Red Sox starters with a quality start, he's gone five innings in each of his outings and given Boston a chance to win. He threw five shutout innings in his previous outing, against Cleveland, but tired in the sixth and allowed three runs. Still, he earned his first victory and gave the Red Sox what they needed.
"In the starting role, he's done an excellent job of getting through those five innings," Farrell said. "Maybe the last time out, because we needed some innings, we probably pushed him an inning too long. But still, his preparation, his work in between starts, has been very good. He's stepped in and done a very good job."
The Red Sox beat the A's, 9-6, on Monday to improve to 2-2 on their current 10-game homestand. They are 8-2 in their last 10 games and 6-4 at Fenway this year.
Right-hander Bartolo Colon will start for Oakland and look to stop the club's four-game skid. The A's are 3-0 this season when he takes the mound.
Colon has gone at least six innings in each of his outings this year, and is 2-0 with a 3.32 ERA. The veteran has faced the Red Sox 26 times during his 16-year career, going 8-11 with a 3.98 ERA against them. He is 6-6 at Fenway Park in 16 appearances.
Oakland is 4-6 over its last 10 games after starting the season 8-2. The A's are winless on their current six-game road trip.
Athletics: Wells expected to join club
The A's acquired outfielder Casper Wells from the Blue Jays on Monday in exchange for cash; he is expected to join the team at Fenway Park on Tuesday.
Wells hasn't played since Spring Training, when he was with the Mariners. Still, he can play all three outfield positions and has an above-average arm. In 93 games for the Mariners in 2012, he hit .228, with 10 home runs and 36 RBIs.
Catcher John Jaso played with Wells in Seattle last season, and calls him "a hard-nosed guy."
"I watched him make a lot of good catches in the outfield, those full sprints into the walls and snagging those balls you don't think will get caught," Jaso said. "I think he's a great addition to the team."
The A's will likely option Michael Taylor to Triple-A Sacramento on Tuesday to open a roster spot for Wells.
• Outfielder Yoenis Cespedes took batting practice before Monday's game for the first time since going on the DL with a strained left hand. He is expected to take BP again on Tuesday and Wednesday, then begin a Minor League rehab assignment with Sacramento on Friday.
Red Sox: Middlebrooks breaks out of slump
Third baseman Will Middlebrooks ended a 4-for-45 skid with a three-run homer over the Green Monster in the fourth inning on Monday. It was his first homer since April 7, when he clubbed three at Toronto. He is hitting .181 with five homers and 10 RBIs this season.
• Shane Victorino returned to the lineup on Monday after missing Sunday's day-night doubleheader with tightness in his lower back. He batted second and went 1-for-4 with a run. The Red Sox are 13-4 with him in the lineup.
• Red Sox outfielder Jonny Gomes is 5-for-13 in his career against Colon, with two solo homers and a triple.
• The A's lead the American League in runs, with 106 in 20 games.
Austin Laymance is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.