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The Japanese boxing superstar Naoya Inoue remained the undisputed world super-bantamweight champion when Irish challenger TJ Doheny dropped to his knee and quit in the seventh round because of an apparent back injury on Tuesday.

Doheny complained of a “twinge” after walking back to his corner gingerly. Before then, he was getting pummelled by Inoue, who celebrated his technical knockout – for a 28th successive win – in muted fashion after winning in Tokyo.