Wacha escaped a pair of jams with strikeouts, and the St. Louis Cardinals snapped a fifth-inning tie en route to a 5-2 victory on Tuesday night.
"I hadn't been doing that in my last three starts," Wacha said. "It was nice to be able to start making pitches and being able to execute."
Daniel Murphy couldn't deal with the changeup when he struck out with runners on second and third to end the fifth inning.
"I don't think I swung at a single strike the at-bat I struck out," Murphy said. "He threw the ball well to me, and I helped him out."
Murphy wasn't alone.
"I don't think there are too many right-handers with a better changeup," Cardinals manager Mike Matheny said. "I think that's accepted league-wide."
Yadier Molina hit his first homer since May 24 for the Cardinals, who have won eight of nine and will go for a three-game sweep on Wednesday. They have won a season-best five in a row and are a season-best seven games above .500.
"There's many sleepless nights," Wright said. "I won't lie and say it's easy or it doesn't bother me, but you have to understand there's not too many players, if any, that can go through a whole season and ride that roller-coaster ride a little bit."
Mets manager Terry Collins batted the pitcher eighth, with Eric Young Jr. hitting ninth, for the second straight game in an effort to stimulate the offense. During the 14-game slump, the Mets have scored two or fewer runs seven times.
Wacha (5-5) gave up a run and five hits in six innings. Fanning Murphy preserved a 1-all tie, and he struck out Ruben Tejada with two on to end the sixth when the Cardinals led 3-1.
Wacha had a career-best 10 strikeouts on April 23 at New York but also had a career-worst five walks and lasted four innings in a loss.
Jon Jay's RBI triple with two outs in the fifth gave the Cardinals the lead, and Matt Holliday followed with an RBI double. Pinch-hitter Kolten Wong and Peter Bourjos added RBIs in the sixth, with both runs unearned after second baseman Murphy dropped Daniel Descalso's slicing, looping liner with a man on and two out.
"I just misplayed it," Murphy said.
Jay is batting .405 (15 for 37) in his last 12 games with four multi-hit games. It was his first RBI since May 30.
"He's on a real good run at the plate," Matheny said. "The way he's taking his at-bats ... we've seen this before. You just see him go, and it's fun to watch him go."
Niese allowed five runs, three earned, in six innings. The lefty has made 18 consecutive starts allowing three or fewer earned runs. It is the longest active streak in the majors, extending to last September, but he is just 5-5 during that span.
Wright entered the game 3 for 43 in his last 13 games. He leads the Mets with 34 RBIs, but has just four this month. The home run was his first on the road this season.
Lance Lynn (7-4, 3.16) faces Bartolo Colon (6-5, 4.15) in the series finale on Wednesday. Lynn worked eight scoreless innings in his last start. ... The Cardinals are 20-2 at home against NL East opponents the last two seasons. ... The attendance of 42,209 was St. Louis' 19th sellout in 35 home games.