North West 200 double winner Alastair Seeley is aiming to build on his whirlwind start to the event during Saturday's finale on the north coast in Northern Ireland.

The Mar-Train Racing rider produced two incredible performances to win the first Supersport and Superstock races on Thursday evening, boosting his tally of wins to 12.

Seeley battled back from as far down as 16th position in the Supersport race after losing ground when Lee Johnston slid off at York hairpin. He became embroiled in a battle with Tyco Suzuki's Guy Martin on the final lap and prevailed to seal an unlikely win.

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The 34-year-old was overhauled by BMW riders Michael Rutter and Michael Dunlop in the closing stages of the Superstock race, but passed both on the final lap to secure a sensational brace.

"Lee Johnston made that hard work for me in the Supersport race. I ran on at York trying to avoid him and had to do a U-turn to get back into the action. I could see the group in front of me and I just picked them off one-by-one," Seeley said.

"The win is testament to Tim Martin and his team for giving me a good bike in the Mar-Train Yamaha R6.

"I got a decent gap early on [in the Superstock race] but had to end up working with [Michael] Rutter and [Michael] Dunlop on the last lap for the win.

"I knew where I was going to make the move and once I got past Michael on the coast road I defended my lines and got the victory."

The victories were the first international road race wins for Ulster team Mar-Train Racing and come after Stuart Easton lifted the British Supersport title for the outfit last season.

Five more races take place on Saturday to bring the event to a conclusion, including both Superbike races.