A's lefty Rich Hill scratched from Saturday start after reinjuring groin

Oakland Athletics left-hander Rich Hill has been scratched from Saturday's start inCincinnatiand will undergo an MRI after reinjuring his groin during a bullpen session ahead ofWednesday's game inMilwaukee.

Hill, 36, was scheduled to throw 35 pitches during the workout at Miller Park, but he felt a "grabbing, pulling sensation" on his 33rd and 34th pitches, reported the San Francisco Chronicle.

''It was going great until the last couple of pitches, but then I felt it pull again,'' Hill said, according to the San Jose Mercury News, comparing the severity to that of the original groin strain he suffered May 29 at O.co Coliseum.

"We've got to be sure he's good enough to pitch," A's manager Bob Melvin said. "It was still bothering him a little bit. So, he will not pitch this weekend."

Hill is slated to have an MRI on his left groin Thursday in the Bay Area. According to Melvin, there is a "definite possibility" the big lefty could be placed on the DL.

Hill leads the Oakland staff with an 8-3 record and 2.25 ERA in 11 starts. He was named the American League pitcher of the month for May.

Right-handerKendall Graveman (2-6, 5.49 ERA) will be moved up to pitch Saturday. SouthpawSean Manaea (2-4, 6.20 ERA) will start Sunday.

Information from The Associated Press was used in this report.