ATLANTA (AP) -- Washington Nationals outfielder Bryce Harper has been placed on the 15-day disabled list because of bursitis in his left knee.

Harper has missed the last five games and has been bothered by the knee since he crashed into the wall in a May 13 game at the Los Angeles Dodgers. The move was made Saturday retroactive to May 27.

The Nationals have recalled right-hander Erik Davis from Triple-A Syracuse for Saturday night's game against the Atlanta Braves. The team needed bullpen depth after starter Stephen Strasburg lasted only two innings on Friday night due to a strained right oblique.

Davis was 1-2 with a 3.00 ERA and seven saves at Syracuse.