Ryan Farquhar continues to dominate the 2010 Duke Road Race Rankings After another amazing run at Scarborough's Cock o' the North road races, where he took nine wins from nine starts.

Despite the massive lead, brothers Michael and William Dunlop are doing all they can to challenge the Dungannon man, taking five wins between them at the Walderstown National Road Races, round 11 of the Duke series. They have also dominated practice for the Southern 100, on the Isle of Man's Billown circuit, where racing starts tonight.

Michael, the younger of the pair, took victory in the feature race, The Race of the South, to complete a hat-trick of victories around the 2-mile Southern Irish course. He had earlier secured the winner's laurels in the Open Championship and the Supersport 600cc races.

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William completed a two-stroke double with wins in the races for 125cc and 250cc, with Michael runner-up in the latter. William was also runner-up in the Supersport 600cc race.

Farquhar retains his lead by more than 1,000 points from William Dunlop, and is the runaway favourite to win a fifth Duke Road Race Rankings, and a third in a row.

Ian Hutchinson remains in third thanks to his amazing five TT wins in a week, with Michael Dunlop now less than 100 points behind and Michael Pearson, also competing at the Southern 100, in fifth.

It's a busy few days for the Duke Road Race Rankings, with the Southern 100 running until Thursday, Jurby South National Road Races on Saturday July 17 and Kells in Southern Ireland on July 17 and 18.