FLUSHING, New York (Ticker) -- Top this, Pedro.

Aaron Heilman tossed a one-hitter for his first career complete game and Mike Piazza drove in three runs as the New York Mets extended their winning streak to five games with a 4-0 victory over the Florida Marlins .

The marquee Met pitcher of the series was expected to be Pedro Martinez , who will make his Shea Stadium debut for his new team on Saturday in a game that already is sold out. But Heilman was far more than a warmup act, tossing the 28th one-hitter in team history.

No Met ever has thrown a no-hitter.

"We have a core group of pitchers that are doing well," Heilman said. "I hope (Pedro) goes out and throws a no-hitter. That would be great to see."

The only hit allowed by Heilman was an infield single by Luis Castillo in the fourth. Second baseman Miguel Cairo tried to barehand the ball, but it trickled away for a single.

"I should have used two hands instead of one," Cairo said. "It was hit a little harder than I thought."

Heilman (1-1) has yet to come close to the expectations the Mets had for him when he was taken in the first round of the 2001 draft. He had lost 11 of his 14 major league decisions, including an ineffective outing last week in Atlanta.

But the former Notre Dame star was brilliant on Friday in his second start in place of the injured Kris Benson . Hoping to keep his spot in the rotation, Heilman tied his career high with seven strikeouts and walked three.

"Just an outstanding job," Mets manager Willie Randolph said. "He had good rotation and movement throughout the game."

Heilman retired the first nine batters and faced his only real threat in the fourth, when the Marlins put runners on first and third before Miguel Cabrera lined out.

"He wasn't overpowering, but he threw the ball in and out," Marlins first baseman Carlos Delgado said. "It's all about the results, not how he got there."

The last one-hitter by a Met was by Tom Glavine against Colorado on May 23, 2004. On a 50-degree night, the Mets were happy to have a pitcher who worked quickly.

"When a pitcher is throwing strikes you don't fall asleep." center fielder Carlos Beltran said. "He was on tonight. He had all his pitches."

The Mets opened the season with five straight defeats, but reached the break-even point by defeating Josh Beckett (2-1), who had not allowed a run in his first 15 innings before Friday.

"There was a flaw in my mechanics that made some of my pitches inefficient," said Beckett, who allowed four runs - one earned - in five innings.

Randolph became the first manager in major league history to lose his first five or more games and then immediately follow that with a winning streak to get back to .500.

Florida had won its last six games at Shea Stadium, but committed three errors, including two on the same play by Delgado in the fifth that led to a pair of runs.

Delgado, who spurned a lucrative free agent offer from the Mets to sign with the Marlins, was booed each time he came to the plate. He was hitless in three at-bats.

Piazza was hitting just .148 this season before Friday, but had an RBI groundout in the first and a pair of doubles, including one that drove in a pair of runs in the fifth.

"I felt a little better tonight," Piazza said. "I felt more tension in the first few games. You just have to focus and calm yourself down."

The Mets promptly jumped on Beckett for two runs in the first, beginning with a leadoff double by Jose Reyes . Beckett mishandled Cairo's sacrifice, putting runners on first and third. Piazza drove in a run with a groundout one out later and Doug Mientkiewicz delivered an RBI single.

With a runner on first in the fifth, Delgado booted a ground ball by Beltran. He retrieved the ball and flipped it over the head of Beckett, who was covering first. Piazza followed with a two-run double to left field.