TUCSON, Ariz. (AP) -Billy Buckner had another impressive outing in his bid for a spot in the Arizona Diamondbacks' bullpen.

Buckner threw two hitless innings and lowered his spring ERA to 2.25 as the Diamondbacks beat a Seattle Mariners split-squad 14-6 Friday.

``Buckner had another good outing... He's been basically good every time out,' Arizona manager Bob Melvin said.

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Juan Gutierrez, also a 25-year-old right-hander, struggled early for Arizona - allowing four hits and three runs in the first inning before getting an out.

After his initial trouble, Gutierrez retired six straight hitters, including striking out three. He allowed four hits and three earned runs as his ERA rose to 6.75 in eight innings this spring.

Despite the mixed results, Arizona, pitching coach Bryan Price said both Buckner and Gutierrez are ``establishing some credibility in this camp as frontrunners for bullpen jobs... They're both having good camps.'

Veteran reliever Tony Pena picked up the win with one inning of work, his first appearance since playing in the World Baseball Classic.

Arizona had 13 hits with 11 players getting at least one. Tony Clark hit his first home run of the spring, walked twice and scored two runs.

Seattle took an extended look at left-hander Jason Vargas, a likely long-relief candidate.

Vargas looked good early before struggling in the second and third innings. He threw 2 2-3 innings, allowing four hits and four runs, walking two and striking out one.

``I felt like I made some good pitches,' said Vargas, whose spring ERA is now 7.94. `` I felt really good my first two outings. Obviously my last two haven't been up to par.'

Matt Tuiasosopo went 3-for-3 for the Mariners, who have seven regulars still playing in the WBC.

Notes: Eric Byrnes and Doug Davis had encouraging Friday morning workouts. Byrnes, still nursing hamstring issues from last year, ran the bases at the minor league complex and could rejoin the team as early as Monday. Davis, who missed his last start with a left triceps strain, looked good in a bullpen session. ... The Diamondbacks reassigned pitchers Hector Ambriz, Tony Barnette and Brooks Brown and catcher Ed Easley to their minor-league camp.