Willson Contreras sparked controversy during a Red Sox rehab assignment, protesting an umpire’s pine-tar ruling before striking out and throwing his bat.

Boston Red Sox star Willson Contreras mounted little resistance during one at-bat in Saturday's rehab assignment game with the Portland Sea Dogs.

Willson Contreras (hamstring) went 2-for-4 with a pair of RBI in a minor league rehab game for Double-A Portland on Friday.

Red Sox right-hander Tanner Houck pitched well in his second rehab outing for Double-A Portland on Friday, allowing one run and one hit in three innings of relief against Binghamton.