Juan Manuel Marquez vs. Juan Diaz (2nd meeting)
2010-07-31 : Juan Manuel Marquez 133½ lbs beat Juan Diaz 135 lbs by UD in round 12 of 12
- Location: Mandalay Bay Resort & Casino, Las Vegas, Nevada, USA
- Referee: Vic Drakulich
- Judge: Patricia Morse Jarman 117-111
- Judge: Jerry Roth 116-112
- Judge: Glenn Trowbridge 118-110
Marquez, at 36 ten years older than his opponent, retained his WBO and WBA lightweight titles, and won this rematch by outpunching Diaz 288 to 155 on blows which connected. Marquez broke Diaz' lip to pieces with hard left jabs and hard overhand rights that scored, backing Diaz up during this bout. Marquez had a swollen right eye, but it was not a factor in the bout. 140 pound champion Amir Khan was in attendance and was mentioned as a possible future opponent for Marquez, as was super featherweight Robert Guerrero, a winner earlier in the evening over Joel Casamayor on this card. Diaz, a loser of four of his last six bouts, also was studying for his law school entrance exam in preparation for a career change before the Marquez bout.