Josh Taylor claimed the World Boxing Super Series title and added the WBA light-welterweight world belt to his IBF strap by edging past the previously unbeaten Regis Prograis on points in an absorbing fight.
Neither of the two southpaws had suffered a defeat heading into Saturday's bout in London and their meeting lived up to the hype, with Taylor awarded the victory to improve to 16-0.
One judge had it at 114-114 but two awarded the fight in favour of Taylor, one at 115-113 and the other, somewhat perplexingly, at 117-112.
That margin seemed particularly harsh on Prograis, who left Taylor with a closed-over, swollen right eye but was also bloodied and battered himself.
Taylor started to take control in the middle of the fight as he lent on his slippery opponent, and the Briton was tapping his chest in celebration at the end of a seventh round where Prograis became more ragged.
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The American was struggling with a nose bleed but snapped Taylor's head sideways with a big left hand in the eighth. Taylor wore it well and caught Prograis with successive right-handers in the middle of the next round, and his opponent looked unsteady on his feet when caught by a left in the 10th.
The cut over Taylor's left eye was opened up in the penultimate round and although Prograis drove his opponent back in the 12th, two of the three judges deemed he had not done enough.
"That was a walk in the park, wasn't it," Taylor joked to Sky Sports in the ring afterwards. "What a fight. All respect to Regis Prograis. Great fight, great champion, but the best man won."
Prior to the main event, heavyweight Dereck Chisora stopped fellow Briton David Price, whose corner threw in the towel shortly after their fighter was dropped in the fourth round.
Chisora, who improved to 32-9 with the win, unloaded a barrage of shots on a clearly rattled Price just before the bell sounded to signal the end of the third.
The 36-year-old was then knocked down when an overhand right from Chisora caught the top of Price's head, and although he got up during the count, the towel quickly came in before the bout could restart.
Elsewhere on the card, Lee Selby beat Ricky Burns via a majority decision in a lightweight contest between two former world champions.
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