SAN DIEGO -- Injured right-hander Chris Young will return to San Diego on Tuesday for further testing on his strained right shoulder after making one rehabilitation start.

Young was roughed up on Sunday in his start with Double-A San Antonio, allowing five runs in two-thirds of an inning. He walked four and gave up two hits while getting two outs.

Manager Bud Black said Young is still experiencing soreness in the shoulder and will undergo more medical evaluation later this week.

"I think we're going to have [Young] undergo some tests in another couple of days," Black said. "He's a little sore from his outing, and we'll reevaluate the shoulder probably with another MRI in three or four days.

Young has been on the disabled list since April 7, a day after he threw six shutout innings in his first and only appearance this season with the Padres.

Padres' bullpen catching fire

SAN DIEGO -- While much of the focus lately has been on the Padres' pitching staff as a whole -- which has three shutouts in its last four games, a recent 26-inning scoreless streak and rode a 13-inning stretch without allowing a run into Monday's matchup with the Rockies -- the bullpen has been especially excellent.

Padres relievers, dating back to April 26, when Sean Gallagher allowed three runs in Miami, had kept opponents off the board for 19 2/3 consecutive innings entering Monday.

Closer Heath Bell attributes the success to maintaining a simple approach.

"The bullpen, right now, we're just going out there and hitting our spots," Bell said. "I think we haven't shaken off the catchers that much. The catchers are doing a great job. Our defense is definitely doing a good job behind us. Obviously we're not striking everybody out."

Bell clarified that the performance thus far does not have the team feeling complacent.

"I don't think we're happy with what we've done yet," Bell said. "We still have a long way to go. If you notice, five or 10 minutes after the game, we're in the weight room and trying to get ready to win the next day's game. We're just taking it one day at a time."

Zawadski gets second straight start

SAN DIEGO -- After having some success in his first start in the Majors on Sunday, infielder Lance Zawadski was back in the lineup on Monday for the Padres.

Zawadski singled in his first Major League plate appearance and came around to score on a triple by Tony Gwynn. He later earned a walk and made plays at second base, filling in for David Eckstein.

Manager Bud Black said he liked what he saw from Zawadski in on Sunday, but Monday's start had more to do with Zawadski's switch-hitting abilities.

"I wanted to get the left-hander in there against [Colorado starter Ubaldo] Jimenez," Black said. "There's no brain surgery behind it. We've got 25 guys. You play them all."

Zawadski joined the club on April 30 when he had his contract purchased from Triple-A Portland after shortstop Everth Cabrera was put on the 15-day disabled list.