"He's done a great job all year," manager Tony La Russa said. "He usually puts guys away when he gets two strikes on them, and he had trouble today."
Wellemeyer said his recently ailing elbow was all right but he had trouble making pitches with his slider.
Brad Thompson, who has yo-yoed between the Cardinals and Class AAA Memphis, worked four strong innings of relief, giving up just one hit.
"That's something positive to take out of this game," La Russa said.
The Cardinals, though still 11 games over .500, have won only four of their last 11 home games.
METS 7, CARDINALS 4: The Cardinals touched up Tony Armas for three runs after two innings as Rick Ankiel hit a two-run homer and Skip Schumaker doubled home a run. But they scored only once in the last seven innings.
NOTES AND QUOTES
--The Cardinals are 34-16 when scoring first.
--RHP Ryan Franklin was back in uniform after missing Monday's game with food poisoning, but he did not get into Tuesday's game.
--RHP Chris Carpenter, feeling no pain in his surgically repaired elbow, will be with the club to throw a couple of bullpen sessions before returning to Florida to pitch in simulated games.
--RHP Brad Thompson's four innings of relief represented a season high for the club.
--The Cardinals announced the signing of their first-round draft pick, 3B Brett Wallace of Arizona State, to a contract calling for a $1.84 million bonus. He will be assigned to Class A Quad Cities.
BY THE NUMBERS: 19 -- Blown saves by the Cardinals' bullpen in their first 83 games. They had only 11 blown saves last year.
QUOTE TO NOTE: "It just wasn't going maybe as planned, so give this a shot." -- LHP Mark Mulder, on being activated from the disabled list as a reliever.