PHOENIX - The Mets' season of pain rolled on when the club announced Friday that third baseman Daniel Murphy has been placed on the disabled list.

Murphy suffered a strained left quad while running out a grounder in Thursday's 6-2 victory over the Diamondbacks.

Infielder Danny Muno was recalled from Triple-A Las Vegas.

Murphy's absence further strains a roster that has already been stretched thin. It will also force manager Terry Collins to once again reconfigure his infield.

"We look at what we've got, go to these other young guys and say listen, there's going to be some opportunities," Collins said. "Make the most of it . . . We've got to deal with it."

Meanwhile, catcher Kevin Plawecki was forced out of the starting lineup Friday night with a virus that is causing head congestion. He's listed as day-to-day. Backup Anthony Recker started in his place.

Murphy is the 14th Mets player to land on the disabled list since spring training, joining a list that already includes catcher Travis d'Arnaud and third baseman David Wright, who has been out for all but eight games this season.

"It's not real serious," Collins said of Murphy. "But David's hamstring wasn't very serious, either."

In 55 games, Murphy is hitting .283 with four homers and a team-high 29 RBIs.

"The news definitely could have been worse," said Murphy, who did not offer a timeline for his return.

He will remain with the team through the remainder of the road trip before beginning his rehab at the team's complex in Port St. Lucie.

Despite all their health issues, the Mets entered play in first place, half a game ahead of the Nationals in the National League East. But their challenge will only get stiffer.

Murphy had been one of the most productive bats in a lineup that has scored just 3.82 runs per game, which is ahead of only the cellar-dwelling Brewers and Phillies in the National League.

With Murphy out, Collins will keep Wilmer Flores at shortstop, Ruben Tejada at second base and go with either Muno or Eric Campbell at third.

"It's going to be a day-to-day decision," Collins said.

The righthanded-hitting Eric Campbell started at third base Friday night, even though he entered play hitless in his previous 27 at-bats.

The switch-hitting Muno is hitting just .067 in 15 at-bats. The Mets considered promoting Alex Castellanos, Wilfredo Tovar and highly regarded prospect Matt Reynolds from Triple-A Las Vegas. But Reynolds and Tovar lack experience at third base.

And unlike Castellanos, Muno is already on the team's 40-man roster.

"It came down to Danny Muno is a roster guy," Collins said. "He's been here. So we thought he should be the guy."