Aaron Heilman, Michael Pineda strong; Arizona beats Seattle 5-3

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Arizona Diamondbacks catchers watch drills at Salt River Fields at Talking Stick, the team's spring training baseball facility, near Scottsdale, Ariz., Sunday, Feb. 20, 2011. (AP Photo/Marcio Jose Sanchez) By Marcio Jose Sanchez Arizona Diamondbacks catchers watch drills at Salt River Fields at Talking Stick, the team's spring training baseball facility, near Scottsdale, Ariz., Sunday, Feb. 20, 2011. (AP Photo/Marcio Jose Sanchez) By Marcio Jose Sanchez

SCOTTSDALE, Ariz. (AP) -- Arizona's Aaron Heilman and Seattle's Michael Pineda, both trying to crack the opening day rotations, had strong outings Wednesday as a Diamondbacks split squad beat the Seattle Mariners 5-3.

Heilman is a longtime reliever who re-signed with Arizona with the understanding that he would get a shot at a starting job. He did not allow a hit and struck out two in three perfect innings.

He has yet to give up a run and has allowed one hit in five innings this spring.

Pineda, the top pitching prospect in Seattle's minor league system last season, struck out one with no walks in two hitless innings in his first outing of the spring.

Juan Miranda homered for Arizona.