© 2011 MLB Advanced Media, L.P. All rights reserved.

03/02/11 5:59 PM EST

Big prospect Pineda throws two hitless innings

SCOTTSDALE, Ariz. -- Aaron Heilman was impressive for the second straight outing as he helped pitch a D-backs split squad past the Mariners, 5-3, on Wednesday afternoon before 6,985 at Salt River Fields at Talking Stick.

Heilman, who is in the mix for the No. 5 spot in the rotation, tossed three innings and retired every batter he faced, two by strikeout, and has thrown five scoreless innings this spring.

The D-backs took a 2-0 lead when Justin Upton led off the fourth with a double and Juan Miranda followed with an opposite-field homer to left, his first of the spring. Both the runs came off reliever Yoervis Medina.

One inning later, Upton's double off the wall in right-center scored Willie Bloomquist to give Arizona a 3-0 lead.

The Mariners cut the lead to 3-2 in the eighth inning on Matt Tuiasosopo's two-run single through the hole at short. But Paul Goldschmidt got them back for Arizona with a two-run single in the bottom of the frame.

Michael Pineda, who is battling for a spot in the Seattle rotation, started and was impressive in his two innings of work. The right-hander did not allow a hit and struck out one.

Up next for Mariners: Left-hander Luke French, along with Pineda in the pool to land a job in the back end of the rotation, will get his second audition against the White Sox at Camelback Ranch. French, the organization's top Triple-A pitcher last season, relieved in Sunday's game against the Padres, allowing two runs (one earned) in two innings.

Up next for D-backs: Top prospect Jarrod Parker will make his second appearance of the spring as the D-backs travel to Peoria to take on the Padres. The club's No. 1 pick (ninth overall) in the 2007 First-Year Player Draft tossed a scoreless inning Monday as he continues his comeback from Tommy John surgery.

Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @dbackswriter. This story was not subject to the approval of Major League Baseball or its clubs.