There aren’t a lot of ways to upstage a night like Benny Agbayani had, but Robin Ventura found a way to do it with a pair of grand slams.

The new Mets third baseman became the first player in history to hit grand slams in both games of a doubleheader as the Mets pounded out six home runs and 21 runs to sweep the Brewers 11-10 and 10-1 yesterday to emphatically break out of a three-game losing streak.

It was the second time in his career that Ventura has hit two grand slams in one day and he now has a dozen in his career, tying him for second with mark McGwire on the active list, one shy of Harold Baines.

The last time he did it was Sept. 4, 1995 when he hit a pair in the same game off Danny Darwin and current teammate Dennis Cook, then of the Rangers.

One of only 11 players in history to hit a pair of grannies in the same game, he also last night became the only player to twice hit two grand slams in one day, according to the Elias Sports Bureau.

In a manner of speaking, he joins Cardinals third baseman Fernando Tatis and Red Sox shortstop Nomar Garciaparra, who each hit two grand slams in one day this year, although he was already a part of that exclusive club. Now he also becomes the 19th player in history to do it in consecutive games, and the first Met.

The first was a long fly ball just over the fence in left field in the first inning of Game One off Jim Abbott. The second was a longer shot that came off reliever Jimene Estrada in the fourth inning of Game 2 that made the score 9-0.

Earlier this season, after Tatis hit two grand slams in the same inning, Ventura spoke about how unlikely it is to do it in a single game.

“You come up the second time with the bases loaded and you just say, ‘No way. This can’t happen,'” said Ventura, who came into the day hitless in his last three games. “I’ve had better days with a three-run home run and four hits, but eight RBIs is nothing to complain about.”

Ventura now has a team-high 36 RBIs.

Four RBIs is nothing to complain about either, which is what Agbayani compiled. The recent call-up from Triple-A Norfolk had a pair of home runs off Long Island native Steven Falteisek in Game One, including a three-run job that gave the Mets an 8-6 lead and allowed Al Leiter (2-4) to get his first win in four weeks.

Then, as the crowd of 19,452 began to filter in for the second game, Agbayani gave them a treat with a 421-foot solo blast to left in the seventh, prompting the fans to chant “BEN-NEE, BEN-NEE, BEN-NEE,” until the quiet 26-year-old from Hawaii made a curtain call for the insurance run that was needed.

The chants were heard by the player whom the Mets didn’t even invite to spring training this year, a player who was only recalled because both Bobby Bonilla and Rickey Henderson were on the DL, a player who for the past several seasons has had the minor league distinction of being the toast of Norfolk.

Now, after hitting two-home runs, one triple, five hits overall and collecting four RBIs in the twin bill, Agbayani was the Toast of Shea.

“How can you not hear it?” Agbayani said. “I’m not used to it.”

After Game One, Agbayani was 9-for-10 in three games against the Brewers, prompting Brewers manager Phil Garner to scold his pitchers for making bad pitches to the Agbayani, who also had a triple in the second game.

The Mets also had home runs from Mike Piazza, who hit a two-run blast in the first game – his third in as many games – and Jermaine Allensworth, who hit a home run pinch hitting for Masato Yoshii in the seventh inning of Game 2.