Miami — The game was a gem for seven innings, with the Mets and Florida Marlins scoreless.

Miami — The game was a gem for seven innings, with the Mets and Florida Marlins scoreless.

Florida's wobbly defense ended the pitchers' duel.

The Mets scored their first two runs on errors, and Carlos Beltran's two-run double broke the game open to help them win 6-2 last night.

"It just sort of snowballed," said Paul Lo Duca, who went 4-for-5. "We got a couple breaks, and we took advantage of it."

The Mets' Orlando Hernandez, making his first start since April 24, allowed two hits and walked none in six shutout innings. Florida's Sergio Mitre was just as good, and the game remained 0-0 into the eighth.

"It keeps you on your toes," Mitre said. "There's no room for error."

Alas for the Marlins, they made two. The Mets scored in the eighth when second baseman Dan Uggla bobbled a two-out broken-bat grounder.

Carlos Gomez again put the Mets ahead in the ninth by scoring on a throwing error by shortstop Hanley Ramirez. The Marlins, last in the NL in defense, have committed eight errors in their past three games.

With the score 1-all, Carlos Delgado walked to start the Mets' ninth against Renyel Pinto (0-2). Pinch runner Gomez stole second and took third on a bloop single by Lo Duca.

Ramirez fielded Shawn Green's grounder and went home, but the errant throw sailed and glanced off the glove of catcher Miguel Olivo before he could make the tag, allowing Gomez to score.

Hernandez, activated before the game following a bout of shoulder bursitis, left after throwing 88 pitches.

"The shoulder feels OK," Hernandez said. "But I'm tired — all over."

He gave up a single to Amezaga to start the game, then retired the next 17 batters before Amezaga singled again with two out in the sixth. Hernandez mixed speeds, often throwing in the low 70s to keep Florida's young hitters off balance.

"He never ceases to amaze me," Mets manager Willie Randolph said. "He threw a great ballgame. He's a consummate pitcher. It's good to have him back. Hopefully we can keep him in the lineup."

Notes — RF Green broke a bone in his right foot on a foul tip and left the game in the ninth inning. He said he hopes to be sidelined only a few days and avoid the disabled list.