Integro Yamaha's Jack Kennedy demolished his Dickies British Supersport opposition in Friday practice at the Oulton Park BSB round, lapping more than a second faster than the chasing pack on a drying track.
The Irishman had already established a 1.1s lead over former champion Alastair Seeley in this afternoon's session but a final lap of 1'37.935 saw it increase to almost 1.2s before GP2 runner Mason Law clawed back a few tenths.
EHA Yamaha's Seeley then closed the gap again only for Kennedy to wring out a 1'37.830 which was enough for top spot.
A late lap from GP2 runner Kyle Ryde saw him jump up to second place with a 1'38.876 while Tom Oliver, also with a last-ditch charge, pushed Seeley down to fourth with a 1'38.975.
Law, on the ABM Triumph, finished in fifth place with Kennedy's team-mate Brad Jones in sixth, Gearlink Kawasaki's James Westmoreland in seventh, young gun Charlie Nesbitt eighth, Rory Skinner ninth and GP2's Sam Wilford tenth.