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Tyson Fury says he will beat Deontay Wilder in a world heavyweight title rematch.
The-30-year-old backed Tom Schwarz to the ropes in the second, driving a right-hand home to drop the German to the floor.
Seconds later, with Schwarz bloodied and under attack, his corner threw in the towel as the bout was waved off.
"I already beat him once so I'll beat him again," said Fury. "He's going to get a fully match-fit, sharp Tyson Fury. It's the biggest fight in world boxing."
Fury's British promoter Frank Warren said he is likely to fight again in September or October, possibly in New York, before a rematch against American Wilder.
"It's highly probable that fight will happen early next year. All parties want to make that fight happen," Warren told BBC Radio 5 Live's Sportsweek.