Robbie Erlin’s fifth major league start Wednesday night was also part of an audition.

Recalled from Triple-A Tucson and added to the Padres rotation after Edinson Volquez was jettisoned last weekend Erlin is pitching for his future as well as the present.

Both looked pretty good Wednesday night as Erlin held the Diamondbacks to one run on six hits over six innings as the Padres defeated Arizona 5-1 to salvage the final game of a three-game series.

“Robbie threw the ball well” Padres manager Bud Black said after the 22-year-old left-hander evened his record at 2-2 and lowered his earned run average from 7.15 to 5.97.

“He led with his fastball but his mix (fastball slider change up curve) came into play. His fastball at the top of the zone had life and carry. His arm and hand speed were as good as I’ve seen from his this year. He was throwing great.”

Erlin stopped short of great.

“I left a couple off-speed pitches up” said Erlin “And I had two two-out walks. I was just trying to keep it simple.”

Erlin shut out the Diamondbacks on four singles over the first five innings and retired the first two hitters he faced in the sixth when a walk and back-to-back singles by Aaron Hill and Willie Bloomquist produced Arizona’s lone run.

Offensively the Padres got all they needed from Will Venable and Jesus Guzman.

Venable drove in three runs including two on his 20th home run of the season. Guzman also homered and drove in two runs.

Both hit eighth-inning homers off former Padre Heath Bell. Venable who drove in the Padres opening run with a first-inning double homered deep into the right field seats after Chris Denorfia opened the inning with a single off Bell. Guzman who also drove in a first-inning run with a single reached the seats in left-center with a two-out drive.

“Venable is not missing the mistake breaking ball up in the zone” explained Black as Venable extended his current hitting streak to eight straight games. He has hit safely in 23 of his last 24 games – going going 39-for-100 (.390) with six doubles three triples eight homers 15 RBIs and 20 runs scored plus five steals.