Scottish Open champion Jeev Milkha Singh gained 105 spots to jump up to 87th.
McIlroy, as well as No. 3 Lee Westwood and No. 4 Tiger Woods, can take over the top spot this week. If McIlroy finishes second alone, he can get to No. 1 if Donald misses the cut. Westwood needs to win, as does Woods. For Westwood, Donald needs to finish outside of the top three. In Woods' case, Donald cannot finish better than a tie for third.
U.S. Open champion Webb Simpson is No. 5 and at home with his wife, Dowd, awaiting the birth of their second child. Bubba Watson is sixth, followed by Jason Dufner, Matt Kuchar, Justin Rose and Hunter Mahan.