Formerly ranked No. 2 in the world, Mickelson climbs back to the sixth spot for the first time since June 8, 2003.
Tiger Woods remained a strong No. 1, while Vijay Singh's strangle hold on the second spot lessened. Ernie Els, the Masters runner-up, drastically closed the gap with Singh, but clings to the third spot in the rankings.
Davis Love III and Mike Weir remained in the fourth and fifth slots respectively. Next comes Mickelson, with the injured Jim Furyk and Irishman Padraig Harrington sliding one spot each to seventh and eighth.
Retief Goosen and Stuart Appleby flip-flopped the ninth and 10th spaces from one week ago. The next three golfers stayed put from last week with Kenny Perry, Adam Scott and Chad Campbell remaining in the 11th through 13th spots.
David Toms and the Ulsterman, Darren Clarke, exchanged the 14th and 15th positions from last week. Scott Verplank stayed in the 16th slot.
Nick Price used a tie for sixth place at the Masters to climb six spaces to 17th. Chris DiMarco, who held a share of the lead after round three of the Masters, climbed three spaces to 18th.
Jonathan Kaye slid two spaces to 19th followed by K.J. Choi, who leapt six rungs to 20th. Robert Allenby had the biggest tumble as he dropped from 18th to 23rd this week.
Current World Rankings