Wild card entry Can Oncu took the win in his British Supersport debut at Donington Park.
The Turkish rider started from pole on his Gearlink Kawasaki, taking the lead at the start, before dropping back to second when he was passed on lap two by Luke Stapleford on the Macadam Triumph.
But the World Supersport favourite was taking no prisoners and was soon back ahead, with Stapleford chasing him.
However, Stapleford’s race went wrong on the sixth lap when crashed out, giving Oncu a clearer run to the flag, as he beat Tom Booth-Amos by 2.004secs.
Ben Currie was third, just ahead of Jack Kennedy as TJ Toms rounded out the top five.
Quattro Group British Supersport, GP2 and HEL Cup, Sprint result:
1. Can Oncu (Gearlink Kawasaki)
2. Tom Booth-Amos (PTR Triumph) +2.004s
3. Ben Currie (Oxford Products Racing Ducati) +4.005s
4. Jack Kennedy (Honda Racing UK) +6.025s
5. TJ Toms (R&R Racing) +9.262s