The 31-year-old right-hander is 0-3 with a 4.00 ERA in his last four starts. The Angels were held to just one run in each of his losses of over the stretch.
In Washburn’s last start—his second after two weeks on the DL with inflammation in his left shoulder—he allowed three runs and eight hits in six innings of a 4-1 loss to Toronto on Wednesday.
Washburn said he’s been struggling with his control since coming off the DL.
“My command is weird,” Washburn said. “It just totally leaves me at times and I walk a guy on four pitches, and then it comes right back.”
The Angels have dropped three of five, but still lead Oakland by 2 1/2 games in the West.
Los Angeles was off Monday after splitting a four-game set with visiting Boston over the weekend, including Sunday’s 5-1 loss.
Baltimore is trying to rebound from a three-game sweep to Cleveland.
The Orioles, who had playoff hopes in the first half, fell to 13-23 since the All-Star break and lost for the 26th time in 36 road games—despite opening a six-game trip with a three-game sweep in Oakland.
“I’m disappointed,” said Sam Perlozzo, who is 9-7 as interim manager. “I didn’t expect to come in here and get swept.”