Baltimore: LHP Jamie Moyer, recently released by the Rockies, signed a minor league deal with the Orioles, and the 49-year-old veteran will pitch for Class AAA Norfolk (Va.) on Saturday. Moyer made 10 starts for Colorado this season, going 2-5 with a 5.70 ERA. ... LHP Zach Britton, out all season due to a left shoulder impingement, was activated from the 60-day disabled list and optioned to Norfolk. Britton, 24, had gone 2-0 with a 2.25 ERA in three rehab starts. To clear a spot for him on the 40-man roster, RH reliever Stu Pomeranz (pulled left side muscle) was transferred from the 15-day DL to the 60-day DL. ... 1B Ryan Ripken, the 18-year-old son of Cal Ripken Jr., was selected by the Orioles in the 20th round of the draft. The younger Ripken, who starred at Baltimore's Gilman School, has committed to play for South Carolina. His father and uncle played for the Orioles, and his grandfather managed the team.
Boston: RHP Daisuke Matsuzaka will make his first major league start of the season against Washington on Saturday -- one date shy of the first anniversary of his Tommy John surgery. Matsuzaka went 0-3 with a 3.65 ERA in a total of eight rehab starts for three teams in the Boston farm system. He made a 1 1/3-inning tune-up start Tuesday for Class AAA Pawtucket (R.I.). ... RHP Daniel Bard will make his first start for Pawtucket on Friday, but his innings will be limited, according to GM Ben Cherington. The team hasn't discussed whether Bard's future role will be as a starter or a reliever, Cherington said.
Chicago: LHP John Danks threw a side session, and he's next scheduled to make a rehab start for Class AAA Charlotte (Fort Mill, S.C.). Danks, out since May 20 due to a strained left shoulder, hopes to return to the White Sox after one minor league appearance. ... 3B Brent Morel (lower back strain) was hitting .320 (8-for-25) through seven rehab games with Charlotte, but manager Robin Ventura said there was still no timetable for Morel's return to the major league roster. "Every once in a while, he still feels something," Ventura said.
Cleveland: OF Johnny Damon, who missed two games following the birth of twin daughters, was activated from paternity leave. C Luke Carlin, who had filled in last week when C Carlos Santana was on the disabled list and C Lou Marson was out due to a cut lip, was optioned to Class AAA Columbus (Ohio). Carlin went 3-for-14 (.214) in four games with Cleveland. ... RHP Chris Schwinden was claimed off waivers from Toronto and optioned to Columbus. The Blue Jays had claimed him off waivers from the Mets on Saturday. Schwinden, 25, allowed 13 runs in 8 2/3 innings over three games (two starts) for the Mets this season.
Detroit: C Alex Avila, who re-injured his right hamstring and had to leave Tuesday's game, was placed on the disabled list. The same ailment had kept him out of the previous two games. The Tigers purchased the contract of C Bryan Holaday from Class AAA Toledo (Ohio), where he was hitting .248 with no homers in 36 games. "He's a terrific thrower," manager Jim Leyland said. ... RH reliever Jose Ortega was recalled from Toledo to give the Tigers more bullpen depth. He was 3-4 with a 4.03 ERA over 23 appearances in Class AAA. C Omir Santos, who went 1-for-8 in three games, was designated for assignment.
Kansas City: C Salvador Perez will begin a rehab assignment Thursday with Class AAA Omaha (Papillion, Neb.). Perez, who had right knee surgery in spring training, has been playing in extended spring training games in Surprise, Ariz., but manager Ned Yost said the 22-year-old has not caught more than seven innings in a game. ... With off days in the schedule Thursday and Monday, Yost said the Royals would go with a four-man rotation until adding back a fifth starter during the June 15-17 series at St. Louis. LHP Will Smith was optioned to Omaha on Tuesday.
Los Angeles: RH reliever LaTroy Hawkins (broken right pinkie finger) made his second rehab appearance Tuesday, throwing a perfect inning for Class AAA Salt Lake (Salt Lake City). He will pitch for Salt Lake again Thursday, and he could be activated this weekend. ... OFs Mark Trumbo and Torii Hunter hit back-to-back home runs in the second inning Tuesday, the first consecutive homers for the Angels since May 25, 2011 (Hunter and IF Alberto Callaspo). For Hunter, the home run was his first extra-base hit since May 11.
Minnesota: C Joe Mauer didn't start any of the three games at Kansas City due to a sprained right thumb. With the team idle Thursday, Mauer will be reassessed Friday before the series opener against the Cubs. Mauer had played in 52 of 53 games before this week, a great improvement over 2011, when he missed 80 games due to ailments ranging from leg weakness to pneumonia. ... RHP Liam Hendriks is 4-0 with a 2.39 ERA in six starts since being optioned to Class AAA Rochester (N.Y.) on May 7. He threw a seven-inning shutout Monday in a doubleheader, striking out eight.
New York: RH reliever Mariano Rivera will undergo surgery to repair the torn anterior cruciate ligament in his right knee Tuesday, nearly six weeks after he sustained the injury. Rivera's operation was pushed back a few weeks after a blood clot was discovered in his right knee. Rivera was told last week that the blood clot was gone, though he will have to remain on blood-thinning medication for an unspecified time following the surgery. ... LF Brett Gardner (right elbow strain) is scheduled to play in a game Thursday, most likely for high-A Tampa. Manager Joe Girardi said Gardner experienced "a little stiffness" after his extended spring training game Tuesday, but it was not a surprise, as he hadn't played in a game in four weeks.
Oakland: Kila Ka'aihue became the third player to lose the Athletics' first base job this season, as he was designated for assignment. Brandon Allen was previously claimed off waivers by the Rays, and Daric Barton was optioned to the minors. Ka'aihue hit .234 with four homers and 14 RBI in 39 games. The A's purchased the contract of OF/1B Brandon Moss from Sacramento (West Sacramento, Calif.), and he got the start at first base. Moss was batting .286 with 15 homers over 51 games in Class AAA. ... RH reliever Andrew Carginan, who sprained a right elbow ligament Tuesday, was placed on the disabled list. RH reliever Evan Scribner was promoted from Sacramento, where he was 3-0 with six saves and a 3.31 ERA in 23 appearances.
Seattle: RHP Felix Hernandez is scheduled to throw a bullpen session Thursday or Friday, after which the Mariners will assess the status of his ailing back. Hernandez missed his scheduled Wednesday start, and he would like to return to the rotation by Sunday's series finale against the Dodgers in Safeco Field. ... CF Franklin Gutierrez has progressed to playing the full nine innings on his rehab assignment with Class AAA Tacoma (Wash.). Gutierrez, sidelined initially due to a pectoral muscle injury and more recently because of plantar fasciitis, is 4-for-12 (.333) through four rehab games.
Tampa Bay: 3B Evan Longoria, sidelined since May 1 due to a partial tear of his left hamstring, said he is getting close to starting a rehab assignment. He hopes to return to the Rays in mid-June. ... 1B/OF Brandon Allen was activated from the disabled list and designated for assignment. Allen hit .154 (2-for-13) with one homer and three RBI for the Rays before he was sidelined due to a strained right quadriceps. He subsequently batted .255 (13-for-51) with two homers and four RBI in 14 rehab games for high-A Charlotte (Port Charlotte, Fla.).
Texas: LHP Derek Holland's fastball velocity fell during his Tuesday win at Oakland, but there was an explanation: Holland has been battling a stomach virus for nearly two weeks. He's lost between 10 and 15 pounds, which he said left him fatigued by the middle innings. Holland said he likely will undergo some gastrointestinal tests when the club returns home. ... OF Josh Hamilton said he was offered the captaincy and then a spot on the AL's Home Run Derby team for the All-Star break, but he declined. "It's just not the right timing. I want to be healthy and do the best for our team," he said.
Toronto: IF/C Yan Gomes, recalled from Class AAA, got the start at first base. "It gives us another potent right-handed bat to go up against a left-hander," manager John Farrell said. Gomes had gone 11-for-35 (.314) with two homers and eight RBI in eight games after being optioned to Las Vegas. RH reliever Jesse Chavez, who allowed three runs in five innings May 27 in his only appearance with the Blue Jays, was demoted to Las Vegas. ... OF Vladimir Guerrero, 37, is 3-for-17 (.176) with no RBI through four games for Las Vegas. He had gone 9-for-20 (.450) with four homers in four games for high-A Dunedin (Fla.) after signing with the Blue Jays last month.