Sergey Lipinets stopped Lamont Peterson in the 10th round of a brutal welterweight bout Sunday night at the MGM National Harbor in Oxon Hill, bringing Peterson to declare an end to his career just minutes after his trainer threw in the towel. Fighting for the first time in 14 months, Peterson (35-5-1) started strong but began to lose ground to Lipinets (15-1, 11 KOs). After appearing close to a knockdown two rounds prior, Lipinets felled Peterson in a neutral corner at the end of the 10th. Peterson staggered to his feet as trainer Barry Hunter tossed the towel in, and moments later Hunter held Peterson in his arms in the center of the ring. Earlier, Lamont’s brother Anthony (37-1-1) fought former IBF 130-pound title holder Argenis Mendez (25-5-2) to a split draw in a 10-round bout at 140 pounds. Between the Peterson brothers’ fights, Jamontay Clark (14-1) outpointed Vernon Brown on all three cards at 154, though most in the crowd booed the decision.