Originally posted by Psychotron
Hulk won, he didn't cheat in some way, but it was because Thanos arrogantly turned his back on him after he snapped Hulk's neck and Hulk had help from Colleen with the mind stone at the end. In other words, Thanos didn't fight at his best, didn't fight smart and Hulk had some help, so this fight is not a conclusive victory for Hulk.
Thanos was out of it by the time Colleen got to him. He couldn't even defend himself after the Hulk punch. Hulk was still at 100% while Thanos was helpless. All Hulk had to do was press his attack after that since Thanos was barely able to stand. If he couldn't defend himself against her, he stand zero chances at fighting Hulk any longer.