Leiter hasn’t pitched since May 11 at Arizona because of tendinitis in his left shoulder. The 39-year-old southpaw was 1-2 with a 2.52 ERA in seven starts this season before going on the 15-day DL on May 20.
He threw 25 game-simulated pitches in a workout session Saturday, and reported no discomfort.
“I feel good, and I’m starting to feel better,” Leiter said. “This has been a career-long thing with me and my left shoulder, but it’s also something that comes with pitching a couple thousand innings, and in all kinds of conditions.
“I’m a little more conscious of things now and I’m making an effort at staying stronger and healthier.”
Leiter will oppose Kevin Millwood, who has compiled a 6.59 ERA in May. The 29-year-old right-hander is 0-1 with a 9.00 ERA in his last three starts, including his worst outing of the season—a 6-1 home loss to Atlanta on Thursday.
Millwood gave up six runs and six hits along with six walks in a season-low four innings. The runs and walks were both season highs.
“I’m not able to locate my fastball, and it’s pretty much killing me,” Millwood, who had won his previous four decisions.
The Mets ended a four-game slide by taking the series opener 5-3 on Monday in a game twice delayed by rain for a total of 3 hours, 40 minutes.
“It’s a 12-hour day, but it paid off,” Mets manager Art Howe said.
The Phillies managed just five hits, including four singles, in Monday’s loss.
“Offensively, we didn’t get anything going,” said Phillies manager Larry Bowa, whose team has alternated wins and losses in its last nine games.