COPENHAGEN -- Former world heavyweight champion Mike Tyson was given a tougher bout than expected on Saturday before he stopped Denmark's Brian Nielsen at the start of the seventh round in a non-title fight at the Parken National Stadium.

The official verdict was technical knockout after one second of the seventh round, when referee Steve Smoger was called over to Nielsen's corner and was informed that the Danish boxer could not see out of his left eye, Reuter reported.

"Hy eye kept swelling and after the last few punches I could not see," Nielsen said immediately after the contest.

Tyson began the bout in his usual aggressive style hoping to finish it early with some brutal hooks. But Nielsen soaked up a lot of punishment and even managed to land a few telling blows of his own.

Despite appearing to have weathered the storm, Nielsen -- who was cut in the second round and floored at the end of the third -- had no complaints when Smoger called an end to the bout.