The only change to the top 10 came in the last position, with Padraig Harrington moving past Retief Goosen and into the 10th spot.
No. 1 Tiger Woods was followed again by Phil Mickelson, Jim Furyk, Adam Scott, Ernie Els, Vijay Singh, Henrik Stenson, Geoff Ogilvy and Luke Donald.
Harrington and Goosen were trailed by No. 12 Sergio Garcia.
Rory Sabbatini moved up to 13th, dropping Masters winner Zach Johnson to 14th, while Trevor Immelman and Paul Casey remained 15th and 16th.
Choi was followed in the No. 17 position by Stewart Cink, who remained 18th, and Justin Rose, who dipped two places to 19th. Charles Howell III fell one spot to round out of the top 20.