Rapid Reaction: D'Backs 6, Mets 4

WHAT IT MEANS: The Mets lost starting pitcher Mike Pelfrey when a line drive struck his right elbow. He had a contusion, but X-rays were negative. He exited in the fifth with a 4-2 lead.

The Mets have dropped four in a row to fall three under .500 for the first time since June 21 and are 3-10 in their last 13 games.

The Mets will try to avoid a sweep tomorrow against the NL West-leading Diamondbacks, who have won five in a row.

ABOUT THAT GUY: Pelfrey had thrown three consecutive scoreless innings before he exited in the fifth when Gerardo Parra’s line drive struck him near the right elbow. Swelling was visible. The Mets led 4-2 with no outs in the fifth when D.J. Carrasco replaced Pelfrey.

After a sacrifice bunt and a hit batter, Carrasco gave up a three-run home run to Ryan Roberts, his 16th, for a 5-4 Arizona lead.

Pelfrey allowed three runs (two earned), struck out three and walked none in four-plus innings.

He allowed two runs in the first on Justin Upton’s RBI single after a Roberts double. Upton stole second and advanced on catcher Ronny Paulino’s throwing error. Upton scored on a sacrifice fly.

Ruben Tejada tied the game with a two-run double in the second.

Pelfrey helped his own cause by hitting an RBI single for a 4-2 lead in the fourth.

EARLIER IN THE DAY: Before the game, Pelfrey met with manager Terry Collins regarding his hot-button comments in the New York Post. The newspaper quoted him as saying Friday, “It’s unrealistic for anybody at the end of last year to come in and say, ‘The Mets, this is a one-year thing, next year we’re going to win it all.’ It’s unrealistic.” Collins said Pelfrey was probably speaking out of frustration for his own disappointing season.

CHECKING IN: In his second start for the Mets, Mike Baxter showed speed. His first career triple gave the Mets a 3-2 lead in the fourth.

RANDOM NUMBER: Pedro Beato allowed a run in the sixth. He has given up at least one run in five of his last six outings.

NEVER MIND: Jason Bay was originally credited with a single in the second inning, but upon further review, the hit was changed to an error for third baseman Ryan Roberts. The grounder skidded off his glove. After Mike Baxter singled, he and Bay advanced on a passed ball and scored on Tejada’s game-tying double.

WHAT’S NEXT: In the three-game series finale, Chris Capuano (9-10, 4.51 ERA) starts for the Mets against Diamondbacks right-hander and Staten Island resident Jason Marquis (8-6, 4.48) at 4:10 p.m. ET.