British Superbike champion Tommy Hill claimed victory in the first race of the meeting at Oulton Park on Sunday.
The Swan Yamaha rider, who started from the fifth row of the grid, powered past team-mate Noriyuki Haga after the race had to be restarted following a red flag.
The race was halted temporarily when Jon Kirkham suffered concussion after crashing heavily.
Haga came home second, 1.525 seconds behind Hill, with Josh Brookes (Tyco Suzuki) third.
The win gave Hill a two-point lead at the top of the standings and he hailed the win as the best of his career.
He said: "People talk about the last race of last season when I won the title as being the best but for me this one has to be one of the best.
"I went into it with an open mind as I knew that it would be tough because of my starting position but my bike was working well and I went for it. Okay, the race was stopped, but on the re-start Nori pushed on hard but I wanted this one, I really did."
Hill will look to increase his lead in the first of tomorrow's two races, having qualified on pole ahead of Shane Byrne, Brookes and Haga.
Update:
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