Will Middlebrooks jumped and sprinted and lunged in shallow right field of Fenway Park on Saturday morning, testing the strained calf that sent him to the 15-day disabled list two weeks ago.
As is sometimes the case with call-ups from the minor leagues, Brock Holt's trip to the big leagues was rushed.
The Red Sox lost yet another challenge on Friday night. They're now 0-for-4 on the season.
John Lackey and the Red Sox can't contain the bottom of the Orioles lineup, dropping the series opener, 8-4.