OAKLAND, Calif. — The Boston Red Sox plan to place right-hander Justin Masterson on the disabled list Thursday after he struggled with velocity in his last two starts.

Manager John Farrell made the announcement about Masterson’s arm fatigue before Wednesday’s series finale against the Oakland Athletics, a day after Masterson threw only one of his 57 pitches at 90 mph. Masterson allowed six runs and six hits, failing to make it out of the third inning in a 9-2 loss.

Masterson’s fastball has averaged just under 89 mph this season, down more than 2 mph from September.

Masterson (2-2) is 0-2 over his last two starts and winless in four outings since winning his first two decisions to begin the season. He has a 6.37 ERA in seven starts since joining Boston with a $9.5 million, one-year deal in December.

RAYS: Left-hander Drew Smyly will miss the rest of the season because of a shoulder injury.

Smyly, 25, came back from a spring bout of tendinitis to make three starts, but complained of tightness in his arm during a start at Boston on May 5.

ORIOLES: Right-hander Jason Garcia was placed on the 15-day disabled list, while right-hander Mike Wright was recalled from Triple-A Norfolk.

• The Orioles will reimburse hourly employees at Camden Yards who lost wages during the week of April 27 after riots broke out in Baltimore and altered several games in the Camden yards schedule.

About 1,000 game-day concessionnaires are among those to be compensated.

ROCKIES: Colorado is among the teams utilizing the shift more often this season, relying on analytics to be more aggressive on defense. Through Sunday, Colorado has shifted the infield 141 times on balls in play and is on pace for 816, which is seven times the Rockies’ total last year and by far the highest percentage increase in the majors, according to Baseball Info Solutions.

The next closest is Arizona, which is on pace for 659 shifts, 2.6 times more than a season ago.

As a whole, moving infielders from left to right – or right to left – and back again is trending up across the majors. So far, teams have shifted on 3,395 balls in play this year, which factors out to 17,666 times over a 162-game season.

That is on pace to be up nearly 33 percent from last year’s total of 13,298. There were only 2,357 shifts in 2011.

Besides the Rockies and Diamondbacks, other teams relying on the shift more often include Detroit (on pace for 532), Cincinnati (502) and San Diego (491).

INDIANS: Adriana Aviles, the 4-year-old daughter of infielder Mike Aviles, is being treated for leukemia at the Cleveland Clinic. Aviles, who is on family emergency medical leave, might rejoin the Indians this weekend in Texas, but Manager Terry Francona said he will be given all the time he needs to be with his family.