Bjorn, who matched the course record with a 6-under 66 in the second round, fired a 5-under 67 Saturday. Casey shot a 4-under 68 and Wall carded a 2-under 70.
The tournament finally got caught up Saturday, after a six-hour wind delay on Thursday disrupted play on both Thursday and Friday. The second round was completed Saturday morning, and all 72 players who made the cut managed to finish the third round Saturday.
However, Sunday's forecast calls for more inclement weather -- so start times have been moved up for the fourth round, and players will go out in threesomes off both the first and 10th tees.