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06/22/12 9:20 PM ET

Bass searching for cause of sore shoulder

SAN DIEGO -- Two days after leaving his start with an inflamed right shoulder, Padres pitcher Anthony Bass still wasn't quite sure what to make of the injury.

"It feels a little achy," Bass said before Friday's game against the Mariners at Petco Park.

Bass, who left Wednesday's start against the Rangers after allowing one run in five innings, visited with Padres team physician Dr. Heinz Hoenecke on Thursday.

Bass was to see another doctor at some point on Friday evening, according to Padres manager Bud Black.

"We're going to see how it goes the next few days," Black said. "We'll monitor it the next day or two and hopefully will be more clear on the direction of our pitching staff."

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For now, Bass is scheduled to make his next start against the Astros in Houston on Tuesday, though that could certainly change.

Bass said that soreness he was feeling on Friday was different than the typical soreness he feels following a start.

"Usually, it's gone by now," he said.

The Padres currently have five starting pitchers on the disabled list: Tim Stauffer (strained right elbow), Dustin Moseley (strained right shoulder), Cory Luebke (reconstructive elbow surgery), Joe Wieland (strained right elbow) and Eric Stults (strained left lat muscle).

Forsythe returns to starting lineup

SAN DIEGO -- When Padres infielder Logan Forsythe first felt some discomfort in his left side 10 days ago in a game against the Mariners, he never envisioned it would have him sidelined so long.

"But I'm not a trainer, either," Forsythe said Friday, smiling.

It was certainly a lot easier for Forsythe to smile on Friday, as he returned to the starting lineup for the first time since May 12 in Seattle. He appeared in three games in-between, although only as a pinch-runner or a pinch-hitter.

On Friday, against these same Mariners, Forsythe was at second base and hitting sixth in the lineup.

"[Head trainer Todd Hutcheson] and his team did a great job," Forsythe said. "They caught it early and it has felt a lot better the past couple of days."

Forsythe, who missed the first 54 games of the season while recovering from March foot surgery, played in eight games before he tweaked his left side against the Mariners.

Forsythe entered Friday's game hitting .273 with four of his nine hits going for extra bases, including a home run on June 5 against the Giants. He figures to see a lot of playing time moving forward, not only playing second base, but possibly some third base and shortstop, too.

For now, he's just happy to be back in the lineup.

"It's baseball, and you're always going to have tweaks like that," Forsythe said. "Hopefully, I'll be able to space them out a little more."

Forsythe went through a high intensity workouts on Tuesday and Wednesday, hitting and fielding, before it was determined that he was ready to return.

"The last three or four days, he wasn't 100 percent," Padres manager Bud Black said. "But now he's at 100 percent."

Padres attend Negro Leagues luncheon

SAN DIEGO -- Padres manager Bud Black, general manager Josh Byrnes and players Will Venable and Kyle Blanks attended the 9th annual Salute to the Negro Leagues luncheon on Friday at the Omni Hotel, which is located adjacent to Petco Park.

Eight former Negro League players, including one of the women of the Negro Leagues, Mamie 'Peanut' Johnson, were in attendance. The last living Negro League umpire, Bob Motley, was recognized during the event.

The event was hosted by Padres executive vice president/senior advisor, Hall of Famer Dave Winfield.

Johnson and Motley were scheduled to throw out the first pitch on Friday at Petco Park before the Padres face the Mariners. The team also was set to honor the former Negro League players during a pregame ceremony.

Short hops

• The Padres entered Friday's game against the Mariners with a 6-6 record in Interleague Play. They have won 12 of their last 20 Interleague games and four of the last seven Interleague series, dating back to last season.

If the Padres win two of three games in this series, they will clinch their third winning season in Interleague Play. The others occurred in 1999 (11-4) and 2010 (9-6).

• Infielder Cory Spangenberg, the Padres' first-round Draft pick in 2011, went on the seven-day disabled list on Friday after suffering concussion-like symptoms on Thursday. He was hit on the left side of his helmet by a thrown ball in pregame drills.

His disabled list stint is retroactive to June 20. Spangenberg is hitting .291 this season with 21 stolen bases in 66 games for Class A Lake Elsinore.

Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.