Khan v Pacquiao - who would win?

The two sparring partners will never meet in the ring according to their trainer but who would win in theory?

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Freddie Roach, the trainer of the British WBA world light-welterweight champion Amir Khan and the Filipino world welterweight champion Manny Pacquiao, says his two stablemates will not fight in the future. Khan will spar with Pacquiao ahead of the Fiipino's fight against Floyd Mayweather Jr in Las Vegas in March but who would win a real bout and why?