Mexican veteran Aron Martinez seized control midway through the 10-round bout and upset former two-division champion Devon Alexander in a unanimous decision.
Chris Areola used a huge right hand to floor Curtis Harper in the first round, withstood a furious rally by his opponent, and pushed the pace over the last two rounds for a UD.
Washington controlled the early rounds but Mansour battled back late, resulting in a split draw on the judges' scorecards.
Leo Santa Cruz outslugged Abner Mares in an all-out war and won by majority decision.
Julian Williams wasted no time as he battered Luciano Cuello to gain a first-round TKO and remain unbeaten.
Roberto Garcia ground down James Stevenson and came out ahead on all three cards. Daniel Jacobs controlled the action and earned a stoppage victory over Caleb Truax in the 12th round. Badou Jack handed Anthony Dirrell his first full-fledged loss with a majority decision.
Lubin won at the 1:58 mark of the sixth round after landing a series of unanswered punches, leading Lora's corner to call an end to the fight.
Still formidable in the ring at the age of 37, world champion Adonis Stevenson successfully defended his 175-pound title against former 168-pound champ Sakio Bika.
Javier Fortuna scored an early knockdown, then dominated down the stretch to gain a 10th-round TKO of Carlos Velasquez and retain his world title.
Amir Khan used his superior speed to continually frustrate Chris Algieri over 12 rounds and win a tightly contested 147-pound battle, while Javier Fortuna off a fierce attack from Bryan Vasquez to win a 130-pound showdown and stay unbeaten.