Right-hander Joe Ross was optioned Tuesday to triple-A Syracuse by the Washington Nationals.
Ross gave up 15 runs and 20 hits in 152/3 innings since his recall from the minors April 19. He gave up five runs and seven hits over four innings to the New York Mets on Sunday.
"His usually hard sinker wasn't sinking and his usually sharp slider wasn't sliding," Nationals manager Dusty Baker said.
Ross was 7-5 with a 3.43 earned-run average with Washington last season.