By Andrew Holleran The New York City Marathon is underway on Sunday morning, but the men’s race’s leader just collapsed. Daniel Do Nascimento, a Brazilian long distance runner, just collapsed during the 21st mile of the race on Sunday morning. Sports business reporter Darren Rovell shared the scary video on his Twitter feed. “NYC men’s marathon leader Daniel Do Nascimento collapses at Mile 21,” he tweeted on Sunday. It doesn’t look good. The prominent distance runner is now getting attention from medical personnel. “Early leader Daniel Do Nascimento is out of the race and receiving attention f…