The $100,000 Betsy Ross for open pacing mares on Sunday at Harrah's Philadelphia proved to be an extremely contentious event that saw a multitude of lead changes in the early going. In the end the two mares that were trailing at the half wound up crossing the wire first and second as Keep Rockin A, a 7-2 third choice in the field, captured the contest in 1:50 1/5 for Brian Sears, followed by 47-1 shot Snobbytown and driver Yannick Gingras. The action was electric in the early stages, as Racine Bell and Rocknificent left hard from the outside, with Racine Bell and Jason Bartlett in control through the 26 3/5 opening quarter. Tim Tetrick was able to maneuver the 8-5 betting choice Soho Burning Love A into a three-hole in the opening quarter but moved assertively to take control passing the stands for the first time. Soho Burning Love A was still motoring as the field hit the half in 53 4/5 over the sloppy going, and Dexter Dunn, driving JK First Lady, marched out of fourth and went on an extended first-over grind to try to get near the leader. JK First Lady towed Machnhope and Keep Rockin A into the action, as those mares followed in second- and third-over positions. JK First Lady was able to go by the leader passing the 1:21 4/5 three-quarters, but Sears wasn't going to wait for the stretch to make his move, as he sent the 5-year-old Keep Rockin A three-deep midway in the final bend with blistering high speed. The Nifty Norman-trained mare devoured the leaders by mid-stretch, with Sears rocking in the bike in harmony with the daughter of Rock N Roll Heaven. Keep Rockin A's 1:50 1/5 clocking was a career-best, as she held Snobbytown at bay easily, with Machnhope holding third. Racine Bell finished fourth. "It's fun to be reunited with Nifty," said Sears following the victory. Keep Rockin A paid $9.60 in winning for the second time in eight starts this year for owner Richard Poillucci. "The trip just worked out perfectly," said Norman. "She's staked to everything."