Manager Dan Jennings said Tuesday before Miami’s game at the Milwaukee Brewers, Phelps had an MRI on Monday and it showed a stress fracture of the radius bone in his right forearm.

It is unclear when the injury occurred, but Phelps’ only start since Aug. 5 was Sunday at St. Louis. He lasted just 2 1-3 innings and was placed on the disabled list the following day.

“It’s unfortunate,” Jennings said. “(The injury) is in a very strange spot on the top of his forearm.”

Phelps, who is 4-8 with a 4.50 ERA, will be replaced in the rotation by Kendry Flores. The right-hander has appeared in five games in relief and has a 2.45 ERA.

Flores becomes the third rookie starter for Miami, which has used 12 pitchers who are 25 years old or younger this season, the most in the majors.

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