The leaderboard remains bunched at TPC Four Seasons, but Brendon Todd finished with a pair of birdies Friday to break away from the pack. Here's how things look after two rounds of the HP Byron Nelson Championship, where Todd holds a two-shot lead:
What it means: At one point eight different players held a share of the lead, but Todd's birdie-birdie finish gave him the top spot as he looks to become the latest University of Georgia product to win on the PGA Tour. The group chasing him includes Kaymer, fresh off his win at TPC Sawgrass, and Casey and Weir, two former top players who have rekindled their form.
Round of the day: Casey played his first nine holes in 1 over, then went lights-out. He shot an 8-under 27 on the back nine, one shot off the PGA Tour's record for nine-hole score, including six birdies and an eagle. Casey's 63 moved him into contention as he looks to win in the U.S. for the first time since the 2009 Shell Houston Open.
Best of the rest: Todd began with six straight pars, then made seven birdies across his final 12 holes en route to a 6-under 64. Each of Todd's five back-nine birdies was from close range, as the longest putt he made was 12 feet on No. 13. He'll now play in the final pairing Saturday as he looks for a third top-10 finish this season.
Biggest disappointment: A difficult season continues for Brandt Snedeker. After an opening 69, Snedeker stumbled to a 4-over 74 to miss the cut. He made just two birdies against six bogeys at TPC Four Seasons, and he'll sit out the weekend for the third time this year.
Main storyline heading into Saturday: Todd will sleep on the lead, but there is no shortage of strong players just behind him. Kaymer is looking to join Tiger Woods and David Duval as the only players to win the Players and the Byron Nelson in back-to-back weeks, while DeLaet looks to end his reign as the most talented player without a PGA Tour win. The group behind Todd at 6 under includes eight players, so the tournament remains very much up for grabs.