Shane 'Shakey' Byrne secured his 50th MCE British Superbike victory following an incident-packed race two at Oulton Park.
Byrne achieved the landmark win on the Rapid Solicitors Kawasaki ZX-10R in a dramatic race that saw Saturday's winner James Ellison plus fellow Showdown protagonist Alex Lowes slide out of contention on the final laps.
It was a powerful performance by triple BSB champion Byrne, who had to settle for second place on Saturday behind Milwaukee Yamaha's Ellison.
The 36-year-old has already cemented his place in the 2013 Showdown and his victory this afternoon further underlined his status as hot favourite to clinch an unprecedented fourth crown.
It was Lowes who flew into first place on the opening lap closely followed by pole man Byrne and the pair engaged in a frenetic tussle as they swapped positions in the early laps with Ellison right in the mix.
Byrne made his move as he slipped underneath Lowes at Lodge and Ellison followed suit, taking second place on the YZF-R1 at Old Hall as Lowes dropped back to third.
Tyco Suzuki's Josh Brookes and Ryuichi Kiyonari on the second Samsung Honda were giving chase in fourth and fifth places as the leading trio went head to head.
At the half-way mark it was still Byrne from Ellison and Lowes with Brookes and Kiyonari making strong headway.
Lowes soon began to come under pressure from Australian rider Brookes and the Tyco Suzuki star placed himself in the podium frame with a move on the Honda man at Lodge.
Brookes then proceeded to reel in Ellison and grabbed second position with a strong pass at Shells Oils corner.
With Byrne dictating matters at the front albeit under pressure from Brookes, the drama began to unfold as Lowes overtook Ellison for third into Island, with the Milwaukee Yamaha rider running wide and sliding off his R1, escaping unhurt.
Kiyonari was now promoted to fourth as Byrne continued to lead from Brookes and Lowes with the race heading for a thrilling conclusion.
On the final lap Lowes went down at Lodge as he chased Brookes for second, gifting team-mate Kiyonari the final place on the rostrum behind Byrne and Brookes, who held station to claim the top two places with only 0.173s separating the pair.
Tommy Bridewell finished in a sensational fourth place on the Halsall Racing Kawasaki to give his new team its best result in the championship, well clear of Buildbase BMW's Jon Kirkham and PJ Jacobsen on the Tyco Suzuki, who completed the top six.
Dan Linfoot (Lloyds British GBmoto Honda), Keith Farmer (Rapid Solicitors Kawasaki), James Westmoreland on the Buildbase BMW and Howie Mainwaring (Tsingtao WKbikes Kawasaki) were the first ten.
Chris Walker was forced out of the race with gearbox trouble.CLICK HERE to view Race 2 results