While Trump was amazing in handling the debate he missed several golden opportunities that could have sealed the deal.
It was really his to win, but he probably got distracted by the crowd or something else at the stage. There were amply openings to talk about email server, deplorables and Clinton Foundation but he did not take advantage of these golden opportunities. There were some areas where he could have easily dismissed like taxes and unknowns saying bad things about him, but he did not. He sent too much time addressing all issues and defending himself.
According to Charles from Fox News it was a draw but for an underdog that is a huge win. Trump did not make any major mistakes and should be able to address those issues in future debates.