Pitcher Casey Kelly, regarded as the Padres' fourth-best prospect according to MLB.com, has had tests performed on his sore right elbow.

Kelly hasn't appeared in a Cactus League game since March 7. He has a 7.71 ERA over three games and 5 1/3 innings this spring.

Kelly, 23, made his Major League debut last season for the Padres, going 2-3 with a 6.21 ERA in six starts. He came into camp last month as one of several candidates trying to win a job in the rotation.

Kelly began last season with Triple-A Tucson, then missed five months with a right elbow strain. He eventually got healthy and reached the Major Leagues in August.

Kelly won his big league debut against the Braves the day he was recalled, tossing six shutout innings. A former shortstop who was converted to a pitcher while in the Red Sox organization, Kelly even got a hit that night, all while his father, Pat, a manager in the Reds' farm system, watched from the Petco Park stands.

"I'm not sure there's anything that could trump that moment," Kelly said last month.