Alastair Seeley defied the odds to win an incredible Supersport race to clinch his 11th victory at the North West 200.

The Mar-Train Racing rider dropped to the back of the first group after an incident at York Corner, when Lee Johnston slid off.

Seeley, though, smashed the lap record in the class with a speed of 116.606mph as he relentlessly pursued the leading group and picked them off one by one to take a breath-taking win from Tyco Suzuki's Guy Martin.

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Josh Brookes earned his maiden podium finish at an international road race with an excellent ride on the Milwaukee Yamaha.

Tyco Suzuki's William Dunlop finished fourth, with the top six completed by Keith Amor on the Rig Deluge Honda and Gary Johnson on the Smiths Triumph.

Michael Dunlop was a retirement on his MD Racing Honda.

Aussie Brookes led the way on the opening few laps with Rutter, Johnson, Dunlop and Martin and Dean Harrison (Mar-Train Yamaha) forming a breakaway group.

As the lead changed hands on virtually every lap, Seeley was making steady progress in the brilliant sunshine on the 8.9-mile circuit and it soon became clear he had every chance of mounting a challenge for an unlikely win.

The British Supersport rider was up to fifth at the start of lap five and surged through to hit the front by the time they reached the Coast Road section, passing Johnson and Martin to take over.

On the final lap, Johnson slipped backwards while Rutter had also dropped off the pace, but Seeley was still under pressure from Martin, who made a pass at the Magherabuoy chicane.

Seeley, though, moved into the lead again and held his position to the flag to secure Northern Ireland team Mar-Train Racing's first road racing victory.

Martin gave the Tyco Suzuki team something to cheer in second place with Brookes impressing on his competitive return to the Supersport class in third.