Defending BSB champion Shane Byrne has clinched pole position at Oulton Park as the qualifying shootout was transformed by rain.
The five-time BSB champion nailed in a 1m 34.016s on his first Q3 lap which proved unbeatable as drops of rain spread across the circuit meaning the majority of riders failed to improve their personal best lap times.
Haslam on the JG Speedfit Kawasaki was one of those riders able to improve with a 1m 34.200s but couldn't close up any further to Byrne so will start race one at Oulton Park from second on the grid.
Maiden double winner at Brands Hatch Indy Luke Mossey completes the front row for JG Speedfit Kawasaki, with the front row reflecting the trio of riders who have been at the head of the pack during free practice.
Josh Brookes heads up row two on the Anvil Hire Yamaha having also improved on his opening lap in Q3, ahead of the second Be Wiser Ducati of Glenn Irwin and the RAF Reserves Kawasaki of Jake Dixon.
Jason O'Halloran claimed seventh on the grid for Honda Racing but may have been aiming for higher after showing his frustrations on track during qualifying, with Peter Hickman (Smiths Racing BMW) and Christian Iddon (Tyco BMW) completing the Q3 contenders.
Full BSB qualifying results from Oulton Park:
1. Shane Byrne GBR Be Wiser Ducati Panigale R 1m 34.016s
2. Leon Haslam GBR JG Speedfit Kawasaki ZX-10R 1m 34.200s
3. Luke Mossey GBR JG Speedfit Kawasaki ZX-10R 1m 34.744s
4. Josh Brookes AUS Anvil Hire TAG Yamaha YZF-R1 1m 34.943s
5. Glenn Irwin GBR Be Wiser Ducati Panigale R 1m 34.955s
6. Jake Dixon GBR RAF Reserves Kawasaki ZX-10R 1m 34.969s
7. Jason O'Halloran AUS Honda Racing CBR1000RR 1m 34.994s
8. Peter Hickman GBR Smiths Racing BMW S1000RR 1m 35.013s
9. Christian Iddon GBR Tyco BMW S1000RR 1m 35.191s
10. Tommy Bridewell GBR Team WD-40 Kawasaki ZX-10R 1m 35.013s
11. Billy McConnell AUS Quattro Plant FS-3 Kawasaki ZX-10R 1m 35.070s
12. John Hopkins USA Moto Rapido Ducati Panigale R 1m 35.090s
13. Bradley Ray GBR Buildbase Suzuki GSX-R1000 1m 35.099s
14. Sylvain Guintoli FRA Bennetts Suzuki GSX-R1000 1m 35.237s
15. James Ellison GBR McAMS Yamaha YZF-R1 1m 35.240s
16. Dan Linfoot GBR Honda Racing CBR1000RR 1m 35.288s
17. Jakub Smrz CZE Lloyd & Jones/PR Racing BMW S1000RR 1m 35.320s
18. Alastair Seeley GBR Tyco BMW S1000RR 1m 35.342s
19. Lee Jackson GBR Smiths Racing BMW S1000RR 1m 35.741s
20. James Westmoreland GBR Gearlink Kawasaki ZX-10R 1m 36.360s
21. Michael Laverty GBR McAMS Yamaha YZF-R1 1m 36.402s
22. Martin Jessopp GBR Ridersmotorcycles BMW S1000RR 1m 36.655s
23. Taylor Mackenzie GBR Bennetts Suzuki GSX-R1000 1m 36.847s
24. Michael Dunlop GBR Bennetts Suzuki GSX-R1000 1m 37.484s
25. Aaron Zanotti GBR Platform Hire Yamaha YZF-R1 1m 37.544s
26. Shaun Winfield GBR Anvil Hire TAG Yamaha YZF-R1 1m 37.813s