He interrupted, was clearly frustrated, openly lied, bragged about himself rather than addressing issues, and rarely managed to answer a direct question from the moderator (and then, only after some prompting after he ran on about his ego). He reverted back to the GOP Primary Trump rather than acting like an adult, or acting like he actually had a clue about the job he's running for. Hillary kept her cool, addressed some of the issues, didn't let him talk over her, and didn't shout over him when he interrupted - which is all she had to do to win this debate. They both made it too much of a catfight, but he was much worse.
He didn't lose anyone from his base, but I doubt he won over anyone who's still on the fence.