Former two-time world champion David Benavidez kept his perfect ring record intact with an 11th-round technical knockout victory against veteran Ronald Ellis in their WBC Super Middleweight Title Eliminator main event on Saturday night’s SHOWTIME CHAMPIONSHIP BOXING telecast, live on SHOWTIME from Mohegan Sun Arena in Uncasville, Conn., in a Premier Boxing Champions event. Phoenix’s Benavidez (24-0, 21 KOs) flashed brilliant hand speed, accuracy and power as he dominated Ellis (18-2-2, 12 KOs) of Lynn, Mass., over 11 rounds before referee Johnny Callas finally waved off the fight at 2:03 of the penultimate round. The 24-year-old star held a significant lead on all three scorecards (99-91, 98-92 x2) at the time of the stoppage. “I rate my performance pretty good but I know I could have done better,” said Benavidez, who extended his perfect record to 24-0. “Ronald Ellis is a tough competitor. I just hope the fans like what they saw. I threw a lot of combinations, punches in bunches. Th