Oviedo, 32, only appeared in 31 2/3 innings with the Rays, all this year, after he was signed before the 2013 season in hopes that he would be an effective late-relief option. However, he never realized that potential, and he finishes with a 3.69 ERA with one save in his Rays tenure. Oviedo, formerly Leo Nunez, had Tommy John surgery in September 2012.
Before this season, Oviedo last pitched in the majors for the Florida Marlins in 2011. He has a career 4.28 ERA with 314 strikeouts.
Hellickson, who was optioned to Double-A Montgomery on July 13 for more work during the All-Star break, is 0-0 with a 2.08 ERA with two strikeouts this season. His lone appearance before Saturday was in a no-decision against the Kansas City Royals on July 8 at Tropicana Field. He missed most of the first half of the season because of recovery from arthroscopic surgery on his throwing elbow.