The Washington Nationals have placed right-hander Luis Atilano on the 15-day disabled list, retroactive to July 21, because of bone chips in his pitching elbow.
Nationals senior vice-president and general manager Mike Rizzo made the announcement Friday night before the Nationals opened a three-game series against the Milwaukee Brewers.
Atilano, a 25 year-old rookie, is 6-7 with a 5.15 ERA in 16 starts this season.
Ross Detwiler, a 24-year-old left-hander, will be called up from Triple-A Syracuse and start on Sunday in place of Atilano.
Detwiler was 2-2 with a 2.48 ERA in seven starts for Syracuse.
It will be his third stint with Washington. He was 1-6 in 14 starts last season.