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Khris Davis was supposed to get the day off Sunday, but was put into the lineup after Mark Canha was scratched against the Nats.
Canha is dealing with nausea and dizziness and has an appointment to see a gastrointestinal specialist on Tuesday.
Trevor Plouffe and Rajai Davis return to the lineup after getting Saturday off.
1. Trea Turner (R) SS
2. Brian Goodwin (R) LF
3. Bryce Harper (L) RF
4. Ryan Zimmerman (R) DH
5. Daniel Murphy (L) 2B
6. Anthony Rendon (R) 3B
7. Adam Lind (L) 1B
8. Matt Wieters (S) C
9. Michael Taylor (R) CF
Tanner Roark -- RHP
1. Matt Joyce (L) RF
2. Chad Pinder (R) SS
3. Jed Lowrie (S) 2B
4. Khris Davis (R) LF
5. Yonder Alonso (L) 1B
6. Ryon Healy (R) DH
7. Stephen Vogt (L) C
8. Trevor Plouffe (R) 3B
9. Rajai Davis (R) CF
Sonny Gray -- RHP
For the second straight season, Kendall Graveman will get the ball on Opening Day for the A's. And for the second straight year, he'll face Mike Trout and the Angels.
The team made the news official on Tuesday morning.
Last year, in a win over the Angels, Graveman went six innings, allowed two earned runs and struck out seven.
"It's something I don't take for granted. It's an honor and a privilege and [I just want to] try to get the season off to a good start and hopefully be a leader of this staff," Graveman told reporters Tuesday in Arizona.
In four seasons with the A's and Blue Jays, Graveman has a 4.11 ERA in 76 appearances.
UPDATE (Mar. 19, 7:45 p.m. PT): The A's officially announced the Cahill signing on Monday. This story has been updated to reflect that.
On the same day the Oakland A's learned they'd be without Jharel Cotton all season, they signed a familiar face to bolster their pitching depth.
Oakland agreed to a one-year deal with Trevor Cahill, nearly 12 years after the A's drafted him in the second round.
Cahill pitched for Oakland from 2009-11. He started 96 games in three seasons with the A's, going 40-35 with a 3.91 ERA and 1.32 WHIP. Since Oakland traded him to the Arizona Diamondbacks in Dec. 2011, Cahill's pitched for six teams.
The 30-year-old won a World Series ring with the Chicago Cubs in 2016, and pitched for the San Diego Padres and Kansas City Royals last season. In 2017, he went 4-3 in 21 appearances (14 starts) with a 4.93 ERA and 1.62 WHIP.