Mayer, who was promoted from Portland to Worcester last week, is dealing with a lower back and upper glute muscle issue.

Houston scores in the eighth to tie it and wins on Yainer Diaz’s blast in the bottom of the ninth.

Despite being held to three hits, Baltimore gets home runs from Adley Rutschman and Gunnar Henderson in a 4-2 victory.

Casas has been on the injured list since April 21 with a left rib strain.

Baltimore is 6-1 this season against the Red Sox, who have lost six of their last eight games.

Boston allows three runs in the ninth to force extra innings before the Rangers pull out the victory in the 10th.

Bridging the gap from Boston’s starters to the final two innings – when games are frequently won or lost – remains very much a work in progress.

Crawford carries a perfect game into the sixth and Wong hits a three-run homer in Boston’s 9-4.

Paxton was diagnosed with a partial right calf tear after leaving his start Sunday in the first inning.