ATLANTA -- Mets left fielder Jason Bay continued his rehab assignment for Triple-A Buffalo on Sunday and went 2-for-4 with a walk as the left fielder.

Bay has been on the seven-day disabled list since suffering a concussion June 15 and has been targeting a return for Tuesday's game against the Nationals.

"I'm going to call him after the game, just to see how he feels and have him tell me what's going on," manager Terry Collins said.

Even if Bay is ready to return Tuesday, Collins said he would likely play in Buffalo's game Monday to get some more at-bats.

"He needs at-bats," Collins said. "This is about at-bats. I'm not worried about the fatigue factor. He's been out three weeks resting. I'm not worried about fatigue."

Duda to have hamstring examined Monday

ATLANTA -- Mets right fielder Lucas Duda will spend his off-day Monday getting his left hamstring examined by a doctor in New York, manager Terry Collins said.

Duda has been dealing with a strained hamstring for a couple of weeks. Collins said Saturday he wants to keep Duda out of the lineup for a few days to allow the injury to heal. But the Mets want to know exactly what they're dealing with.

"We're going to let the doctors determine how bad the strain is," Collins said.

Collins said he didn't think Duda would need a trip to the 15-day disabled list. He also said he doesn't think the injury has contributed to Duda's recent slump. Duda is hitting .246 with 12 home runs, but is 4-for-29 with 11 strikeouts in nine games in July.

Collins said Duda has gotten away from doing what got him to the Majors and has started to swing for the fences too much.

"He's just trying to do what everybody expects him to do, and that's hit the ball out of the ballpark," Collins said. "I told him the other day, 'Just be a good hitter. You're a good hitter, stay who you are.'"

Warthen ejected during meeting on mound

ATLANTA -- Mets pitching coach Dan Warthen was ejected by home-plate umpire C.B. Bucknor during a meeting on the mound in the fifth inning of Sunday's game against the Braves.

Warthen came out to talk to left-hander Johan Santana after he gave up an RBI double to Michael Bourn, giving the Braves a 1-0 lead in an eventual 6-1 win over the Mets. When Bucknor came to the mound to break the meeting up, Warthen aired his grievences about the strike zone. He was ejected.

"At that point in time, it had been going on, it had been building a little bit," Warthen said. "We'd had enough."

Warthen's complaints centered on a 2-2 slider to Paul Janish and a 1-2 fastball to Michael Bourn that Bucknor called balls.

"The inning's over," Warthen said. "Janish is out and Bourn is out. The inning is totally over. And the pitches that [Santana] threw to those guys [Bucknor] had called much worse pitches on our guys."

Warthen contended Bucknor's strike zone was wider with Braves starter Ben Sheets on the mound.

Manager Terry Collins quickly joined the discussion, but was not ejected.

It was Warthen's first ejection this season.

Worth noting

• Despite using the bullpen for eight innings over the last two days, manager Terry Collins said everyone was available for Sunday's series finale against the Braves. Collins said he will have to be "very careful" with left-hander Josh Edgin, who has thrown 37 pitches in the last two days.

• Right-hander Zack Wheeler, the Mets' top prospect, threw a six-hit shutout Saturday for Double-A Binghamton. He struck out seven and walked one. Collins said the reports from the game said Wheeler's command was the best it's been this season.