ATLANTA – Ryan Langerhans hit a two-out, two-run single in the 10th inning and the Atlanta Braves rallied twice for a 4-3 victory over the slumping Mets last night, completing a three game sweep.

This was a stunner for the Mets, who dropped 10 1/ 2 games behind the Braves in the NL East after squandering leads of 2-1 in the ninth and 3-2 in the 10th.

Langerhans tied it in the ninth with an RBI double off Braden Looper (4-7), then came through again in the 10th with Shingo Takatsu just one pitch from escaping a bases-loaded, no-out jam inherited from Looper.

The rookie outfielder fought off one 3-2 pitch, then drove the next one to the gap in left-center to bring home the tying and winning runs.

John Foster (4-1) got the win despite giving up Chris Woodward’s pinch-hit single in the top half of the 10th, which pushed the Mets back ahead.

It didn’t matter. New York lost for the ninth time in 11 games and fell to 4-19 in the regular season at Turner Field in September and October, according to the Elias Sports Bureau.

Tom Glavine pitched into the eighth, but the bullpen denied him a rare win over his former team. The Mets slipped five games behind wild-card leader Houston, which beat Philadelphia 8-6.

New York squandered a chance for more runs in the 10th. With the bases still loaded after Woodward’s bloop single to center, Ramon Castro lined out to shortstop Rafael Furcal, who flipped to second to double off David Wright.

Looper couldn’t even get an out in the 10th. Chipper Jones, who had 34 homers and 102 RBI in his career against the Mets, led off with a single to left. Andruw Jones was plunked in the back by Looper. After falling behind 0-2 on two failed bunt attempts, Julio Franco managed to coax a walk from Looper, loading the bases and bringing on Takatsu.

The side-arming right-hander got Jeff Francoeur and Brian McCann on popups, but couldn’t finish off Langerhans.

Glavine gave up only five hits in 7 1/ 3 innings, but his career record against the Braves remained 1-8.

Glavine was lifted after giving up a one-out walk to Chipper Jones in the eighth. Roberto Hernandez came on to retire Andruw Jones and Franco.

Tim Hudson went eight innings, extending to 11 straight starts in which he has lasted at least through the sixth. He gave up eight hits and two first-inning runs.

The Mets finally scored off Hudson, who pitched 14 shutout innings to win his first two career starts against New York. Cliff Floyd drove in the first run with a groundout and Wright came through with a two-out RBI single.