MIAMI -- Robert Gsellman made another early exit after a rocky start on Tuesday night in Miami, but this time it wasn't because of the way he was throwing. And now, the Mets are down yet another pitcher.

Former Mets' pitcher Ron Darling had some words about that. And they weren't good.

Ron's comments about injuries and training pic.twitter.com/yqf47Nu326 — SNY (@SNYtv) June 28, 2017

With the Mets down 3-2, in the top of the fourth inning in the series opener at Marlins Park, the right-hander pulled up lame trying to leg out out an infield grounder. He was ultimately responsible for the third out, effectively costing the Mets a run, and left the game limping with trainer Ray Ramirez.

Gsellman's grounder deflected off the glove of Marlins' pitcher Dan Straily but second baseball Dee Gordon was there to make a diving flip to first base. First baseman Justin Bour then threw home and Jose Reyes slid in too late to beat it. Gsellman could have beaten the tag had he not pulled up on his run to first base.

Paul Sewald came out of the bullpen cold but was given as much time as he needed to warm up.

The Mets are already down four starters and two relievers, with one of those relievers -- Josh Smoker -- able to make spot starts. The Mets' current spot-starter, Rafael Montero, made a start in place of Zack Wheeler (biceps tendinitis) on Sunday in San Francisco, earning his second career win and his second since his 2014 debut.

Darling, a 13-year MLB vet, may not be wrong: Gsellman lives with Noah Syndergaard, who famously said he put on 17 pounds of muscle over the offseason. Syndergaard, the noted weightlifting fanatic, is currently on the disabled list with a torn lat and many people inside and outside the Mets' organization have wondered if the over training and heavy weights are to blame.

The Mets senior strength and conditioning advisor, Mike Barwis, is known for his football training methods more so than baseball, and since bringing him on board, the Mets' number of disabled list days have tripled. In addition to his Mets duties, Barwis is the director of strength and conditioning for the Michigan football team.

Many have also speculated that Barwis' heavy weights regimen has been the culprit behind the numerous leg muscle injuries that have put outfielder Yoenis Cespedes on the DL.

Gsellman, who allowed seven earned runs in each of his last two outings, gave up three in the first inning. Justin Bour's two-RBI single gave the Marlins a 2-1 lead and Marin Prado then drove in Bour with an RBI double.

Abbey Mastracco may be reached at amastracco@njadvancemedia.com. Follow her on Twitter @abbeymastracco. Find NJ.com on Facebook.