The Washington Nationals activated Chien-Ming Wang from the 15-day disabled list Tuesday. He is expected to pitch in relief.
Wang takes the place of pitcher Ryan Mattheus, who was placed on the 15-day DL, retroactive to May 21, with a plantar fascia strain in his left foot.
Wang, 32, strained his left hamstring during his final spring training start on March 15.
Mattheus, 28, is 2-1 with a 2.25 ERA in 19 relief appearances this season.