Tiger Woods still owns a commanding lead atop the rankings and was followed by fellow American Jim Furyk.
Scott was up two to third, while Phil Mickelson and Ernie Els dipped to fourth and fifth, respectively, to make room for Scott.
The following six players -- Henrik Stenson, Vijay Singh, Geoff Ogilvy, Retief Goosen, Padraig Harrington and Luke Donald -- remained in the sixth through 11th positions.
Sergio Garcia and Trevor Immelman exchanged places this week with the Spaniard up to 12th. Paul Casey held steady at No. 14 and was again followed by Charles Howell III, Nick O'Hern, Robert Allenby and Davis Love III.
Stuart Appleby tied for second behind Scott in Texas, one year after winning that title. The Australian jumped eight spots to 19th this week, while David Toms remained 20th again this week. David Howell fell out of the top 20, dropping two notches to 21st.