12:00 pm Inside the numbers: Rd. 3 set-up By Brian Wacker, PGATOUR.COM NEWTOWN SQUARE, Pa. ?The reason K.J. Choi has a two-stroke lead entering today's third round? Tee-to-green performance. For example, Choi is tied for first in driving accuracy, tied for second in greens in regulation and third in proximity to the hole with an average just over 29 feet on his approach shots. And even when Choi has missed the green, he's scrambled well, making par or better on five of six attempts ?best in the field. No wonder he has just three bogeys so far. The field, meanwhile, is at six bogeys per player on average. The most impressive stat for Choi, however, is also the most important: He's 5-for-7 in converting 36-hole leads into wins. Meanwhile, Chris Riley, who is two strokes back and will play with Choi in today's final group, has been putting on a clinic on the greens. Through two rounds, he's gained over nine strokes on the field with the putter ?easily best in the field with Bryce Molder at just over six strokes gained. Riley has 21 one-putts (also best in the field) and 51 total putts (you guessed it, first in the field) and he's yet to miss a putt inside 10 feet. Filed under: Chris Riley, K.J. Choi