ST. LOUIS -- The precautionary reasons that led to Matt Carpenter's exit from Saturday’s 10-2 win over the Mets seemed to do the trick, as the third baseman stayed in his usual leadoff spot for Sunday’s series finale. Carpenter went 0-for-4 with a pair of strikeouts in the Cardinals' 6-4 win.

Carpenter was officially diagnosed with a left knee contusion after fouling a pitch off of the knee in the sixth inning. He remained in the game at the time, eventually drawing a walk before scoring from first base on Paul DeJong's two-out double.

Carpenter said his knee was “a little swollen and a little stiff” on Sunday, but there weren't any concerns from Carpenter or manager Mike Shildt.

“There would have been a consideration [to keep him out of the lineup] if he wasn’t feeling great, but otherwise, I talked to him yesterday and he said he should be just fine,” Shildt said. “The medical reports checked out today. He came in and had no issue.”

Reyes impressing in Minors

Alex Reyes pitched three shutout innings in his start for Triple-A Memphis on Saturday, as the Cardinals' right-handed reliever continues to work on his command in the Minors. He threw 40 pitches, 25 of those for strikes, and struck out four while allowing one hit and giving up one walk. Shildt said Reyes averaged 97 mph with his fastball.

“Just efficient work,” Shildt said.

Reyes, a longtime top prospect, is in the starting role in Memphis to establish a routine and work on his pitches outside of game action. His history of starting was another reason the Cardinals made the move.

“That was one of the reasons to get him in the rotation in Memphis -- to primarily get him in the structure of the side work and having the ability to throw pitches without feeling like he has to compete,” Shildt said. “ … I think we’re creating a reference point again for Alex to work off of.”

Rehab roundup

Right-handed reliever Luke Gregerson (right shoulder impingement) threw one inning -- nine pitches -- for Triple-A Memphis on Saturday. He gave up one hit, and did not strike out or walk anyone. Gregerson had his rehab assignment moved to Memphis on Friday after making five consecutive appearances without allowing a hit across Class A Advanced Palm Beach and Double-A Springfield.

Carlos Martínez will throw another side session with the Cardinals on Monday before going to Florida later this week for live batting practice. The session on Monday will involve throwing at a higher intensity than Saturday’s 30-pitch session, Shildt said.

UMPS Charity Auction

Major League Baseball umpires will offer up more than 300 items that include autographed sports memorabilia, VIP experiences and upgraded ticket packages during its 11th Annual UMPS CARE Charities Online Auction. The auction is underway and closes at 10 p.m. ET on April 29.

Among Cardinals-related items up for bidding, there are four tickets to a game and an on-the-field visit with a photo. There is also an opportunity to throw the first pitch and two tickets to a Rookie-level Johnson City game.