NEW YORK — Rookie Matt Chapman quickly atoned for a baserunning blunder by hitting a tiebreaking home run in the seventh inning that sent the Oakland Athletics over the Mets 3-2 Sunday, ending New York's four-game winning streak.
With the July 31 trade deadline nearing and far back in the NL wild-card race, the Mets now start a 10-game trip, and there's no telling whether veterans such as Jay Bruce and Lucas Duda will remain on the team when it returns to Citi Field.
Marcus Semien and Khris Davis also homered for Oakland, helping Bob Melvin post his 999th victory as a big league manager. Semien connected on the sixth pitch of the game, and Davis hit his 28th home run in the fourth.
Michael Conforto hit his 19th homer of the season and fifth of the Mets' 6-4 homestand that followed the All-Star break.
Oakland led 2-1 when Chapman opened the fifth with a double and moved up on a wild pitch by Rafael Montero (1-7). But with no outs, Chapman wandered too far from third base and was picked off by catcher Rene Rivera.
After the Mets tied it on an RBI grounder by Jose Reyes, Chapman launched a drive with two outs in the seventh. Chapman showed pop in the minors, and has homered four times since making his major league debut last month, including a drive Saturday night.
The Athletics made another mistake on the bases in the ninth when Jed Lowrie tried to steal second — with pinch-runner Rajai Davis already there, resulting in an out.
Rookie Daniel Gossett (2-5) gave up two runs and five hits in six innings. He snagged a line drive by Curtis Granderson just above his head in the fifth, preserving Oakland's one-run lead.
Santiago Casilla, a possible trade target in the next two weeks, worked the ninth for his 16th save in 21 chances. After Wilmer Flores singled with one out, pinch-hitter Yoenis Cespedes hit a flyball that got fans hollering it might leave the park, but it was caught way short of the warning track.
The A's improved to 3-10 in interleague play, still the worst mark in the majors. The start of the game was delayed 61 minutes because of rain.
Despite the defeat, it was not a total loss for Montero. He was 0 for 28 at the plate in his major league career before lining a two-out single in the fifth. He broke into a big smile and the ball was thrown into the Mets dugout for safekeeping.
Montero then scampered to third when Conforto struck out on a wild pitch that bounced toward the New York bench. Granderson's bid for a tying hit was caught by the right-handed Gossett, who took off his glove, rotated his left shoulder to work out a kink, spit, tilted his hat and shook his head as he slowly walked off the mound.
Athletics: Righty reliever Ryan Dull (strained knee) could rejoin the A's for the finale of the upcoming four-game series in Toronto. ... 1B Ryon Healy didn't start for the second straight game after getting hit in the head by a bad hop Friday.
Mets: Cespedes and INF Asdrubal Cabrera didn't start, with manager Terry Collins saying the veterans told him they could use a day off.
Athletics: RHP Chris Smith (0-0, 2.77 ERA) starts in Toronto vs. LHP Francisco Liriano (5-5, 6.15). Smith made his first major league start earlier this month at age 36.
Mets: RHP Jacob deGrom (11-3, 3.37) has won seven straight starts. He has a 1.51 ERA in that span, striking out 50 and walking 10. He'll face Padres LHP Clayton Richard (5-10, 5.35).