A's Opening Day starter Kendall Graveman will undergo Tommy John surgery, manager Bob Melvin announced to the media in Texas on Tuesday afternoon.
News of Graveman's impending surgery was first reported by Susan Slusser of the San Francisco Chronicle. Slusser reports that Dr. Keith Meister will perform the surgery Monday in Dallas.
Graveman is expected to be out 12 to 14 months, which means he will likely miss most of next season. The 27-year-old right-hander struggled this year, going 1-5 with a 7.60 ERA and 1.66 WHIP in seven starts. For his career, he is 23-29 with a 4.38 ERA.
Graveman was optioned to Triple-A Nashville in April, and made four starts for the Sounds before landing on the DL. He will be the third Oakland pitcher to undergo Tommy John surgery this year, joining Jharel Cotton and A.J. Puk. Injuries have forced the A's to use 12 different starting pitchers this season.
Graveman will $2.36 million this season. He is eligible for arbitration in 2019 and 2020.