Boxing facts
Undercard: Robert Guerrero (26-1-1, 18 KOs) vs. Joel Casamayor (37-4-1, 22 KOs), 10-round junior-welterweight fight.
When: July 31.
Site: Mandalay Bay Events Center, Las Vegas.
Tickets: $50-$350. TV: HBO pay per view $49.95.
Main event: 12-round World Boxing Assn. and World Boxing Organization lightweight championship: Juan Manuel Marquez (50-5-1, 37 KOs) vs. Juan Diaz (35-3, 17 KOs), rematch of the 2009 fight of the year.
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