But Mickelson, who finished one stroke behind Bubba Watson at the Farmers Insurance Open in California, moves from sixth to fourth with a 6.495 average. That knocks Graeme McDowell (6.461) down one place to fifth.
Casey (6.380), who won the European Tour's stop last week in Bahrain, goes from ninth to sixth this week. Steve Stricker (6.027) falls from fifth to seventh and Rory McIlroy (5.938) and Jim Furyk (5.532) are each pushed down one place to eighth and ninth, respectively.
Luke Donald (5.436) again completes the Top 10.
Watson's win Sunday boosts his ranking to No. 18, an improvement of 15 places from last week.