Khan v Peterson rematch in doubt

BBC Sport's Richard Conway confirms that WBA and IBF light-welterweight champion Lamont Peterson has tested positive for synthetic testosterone.

Following a controversial defeat last year, former champion Amir Khan was due to face Peterson in Las Vegas on 19 May and both fighters agreed to random testing before the rematch.

With the date for the fight fast approaching Conway says all parties will be hoping to get the situation resolved quickly.

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