Dario Franchitti moved into the Castrol EDGE Driver Rankings top five for the very first time courtesy of a controversial win in Toronto.
The defending IndyCar champion tipped race leader Will Power into a spin late in the race before going on to claim a fourth win of the season – allowing him to vault Power and Briton Lewis Hamilton for fifth spot.
Power (7) was able to resume the race but was involved in a later incident and was forced to retire, his subsequent loss of points dropping him one place to seventh.
Hamilton (6) meanwhile dropped out of the Rankings top five for the first time since May last year, despite an impressive battling display on home soil at Silverstone. The Brit ran as high as second, but a need to conserve fuel led to late pressure from Felipe Massa, whom Hamilton just held off in a photo finish.
Hamilton's McLaren teammate Jenson Button also fell down the Rankings after an error during the pit stops caused him to retire from the race. He had been running fifth, which would have been enough to hold on to eighth in the Rankings, before misfortune at his second stop.
Button now splits a group of NASCAR drivers, with Sprint Cup Carl Edwards replacing him in the Rankings top eight courtesy of a top-five finish in Kentucky.
Victory at Kentucky went to Kyle Bush, the 26-year-old American taking his third Cup win of the year to move into the series lead and jump two places to 11th in the Rankings. He remains behind Cup champion Jimmie Johnson however, as the Hendrick driver finished third to move up one place and into the Rankings top 10.
One of the biggest gainers of the weekend was GP2 leader Romain Grosjean, who charged to victory in the second race at Silverstone to extend his championship lead and leap eight places to 42nd in the Rankings.
On the same F1 support bill, McLaren AUTOSPORT BRDC Award winner Lewis Williamson (460) claimed a maiden victory in GP3 to rocket up the Rankings, improving 183 places to move inside the top 500 for the first time.
In the world of V8 Supercars, Jamie Whincup (74) and Garth Tander (156) shared the race victories but fell four places each in the Rankings. The big gainer was race two polesitter Craig Lowndes, who secured a pair of top-four finishes to move up 16 places to 106th.
To see the full Castrol EDGE Rankings and the latest positions in the Castrol EDGE Race for 2011, please visit www.castroldriverrankings.com.