JUPITER, Fla. - Maybe Daniel Murphy and Wilmer Flores had better hurry back.

While the Mets' double-play combination nursed injuries Monday, unheralded minor-leaguer Danny Muno continued to mash the ball in his bid to make a big-league roster for the first time.

Starting at second base for Murphy, the switch-hitting Muno -- who also played shortstop and third base last season -- homered and tripled in the Mets' 12-3 win over the Marlins at Roger Dean Stadium.

Muno, a 26-year-old from Long Beach, California, was an eighth-round pick of the Mets in 2011. He is wearing uniform No. 74, which befits his status as a non-roster player.

Muno is batting .400 in 35 at-bats after going 2-for-4 Monday. He could get a lower number on his back by April 6, when the Mets open the season in Washington.

"He's been made aware there's some bench jobs out there," manager Terry Collins said. "He's looked very, very sharp so far."

advertisement | advertise on newsday

Muno hit .259 with 14 home runs, 62 RBIs and a .790 OPS for Triple-A Las Vegas last season. He played 69 games at second, 24 at third and 21 at shortstop.

"I've dreamed ever since I was a little kid of being in the big leagues," said Muno, who tripled home a run against Mat Latos in the Mets' eight-run second inning and homered to right off Vin Mazzaro in the sixth. "It would be a dream come true."

Murphy's Opening Day is in doubt because of a hamstring strain.

Flores, who had been having a terrific spring training, still was having trouble walking after fouling a ball off the top of his foot in the third inning of Sunday's game against the Yankees.

X-rays were negative and Flores was back at Tradition Field Monday with a tight wrap on his foot and a walking boot in front of his locker.

Mets videos

"It was bad," Flores said. "I couldn't even walk on it. But I feel better than [Sunday]. I'm just going to go day-by-day, I guess."

Nothing was broken, but how fast Flores can return to action likely depends on how quickly the swelling goes down and how much pain he can handle.

One good sign could be that Flores played four more innings after suffering the injury. Come to think of it, though, maybe that wasn't such a good idea.

"It's a little swollen," Flores said. "But I can't . . . I'm having a problem walking right now. I'm just going day-by-day and we'll see how it goes."

Even though Flores admitted to difficulty walking, he is optimistic that he will be ready for Opening Day.

advertisement | advertise on newsday

"I'm not worried at all," said Flores, who is batting .342 with two home runs and seven RBIs. "I hope it will just take a few days. That's it."

Ruben Tejada, who started at shortstop, went 1-for-4 and is batting .297.

Notes & quotes: Michael Cuddyer homered for the third time in his last four games. He has five in spring training . . . Curtis Granderson went 3-for-4 and is batting .452 . . . The Mets flipped starting pitchers and will go with Dillon Gee at home against Houston Tuesday and Rafael Montero in Tampa against the Yankees Wednesday.