Jamal James used his superior boxing skills to close the fight strong and keep his perfect record intact.
At the start of the second round, Uzcategui pounced on his rival, finishing off an eight-punch barrage with a clean left hook that forced the referee to wave an end to the fight at the 45-second mark.
Lamont Peterson showed championship-caliber legs in the first half of the fight, but they weren't enough to overcome Danny Garcia, who earned a majority decision at Brooklyn’s Barclays Center.
Robert Guerrero rallied after being knocked down in Round 4, and won a 10-round split decision over Aron Martinez.
Andrzej Fonfara and Nathan Cleverly dueled relentlessly in an instant-classic slugfest.
Moises Flores was the more accurate and aggressive fighter throughout the fight, earning a TKO in the twelfth round.
Rising 130-pound prospect Omar Douglas remained undefeated, winning a wide unanimous decision over Braulio Santos.
Dirrell boxed circles around Rubio, resulting in a victory by unanimous decision with Dirrell winning 100-90 on all three judges’ scorecards.
Shawn Porter won a physical fight that went the distance, earning a 12-round unanimous decision over Adrien Broner, while Errol Spence Jr. notched up a decisive win over Phil Lo Greco.
Adrien Broner completely dominated John Molina Jr. over 12 rounds, winning a unanimous decision and only losing two rounds total on all three judges' combined scorecards.