The Washington Nationals placed closer Koda Glover on the 10-day disabled list because of stiffness in his lower back before Sunday's series finale against the Texas Rangers.
Glover blew his second save in Saturday's 6-3, 11-inning loss and afterward told manager Dusty Baker he had been dealing with "nagging" back pain all day.
The 24-year-old right-hander had converted eight of nine previous save opportunities, but is 0-1 with a 5.12 ERA in his second year in the majors. Earlier this season, he missed 14 games with a left hip impingement.
Washington also activated reliever Joe Blanton from the DL. Blanton went on the DL on May 17 with shoulder inflammation. He's 0-2 with a 9.49 ERA in 14 appearances this season.
Mets manager Terry Collins said slugger Yoenis Cespedes was available to pinch-hit Sunday and would return to the lineup for the following two games when New York hosts the Chicago Cubs. Cespedes, who hit a grand slam in his return Saturday from a left hamstring injury that landed him on the disabled list for six weeks, popped out with the bases loaded to end the eighth inning Sunday in a 2-1 victory over the Atlanta Braves.