Sheffield are through to the Premier League Grand Final after a stunning semi-final triumph over Glasgow - despite a 48-42 loss on the night.
The first leg is pencilled in at Owlerton next Wednesday with the return at the Oaktree 24-hours later.
Tigers were firm underdogs with star trio Simon Stead, Jason Garrity and Dimitri Berge all sidelined through injuries.
But they shocked highly-rated Glasgow on an unforgettable night to prevail 91-89 on aggregate.
A fast-start from the hosts instantly left them on the back foot as two 5-1s in the opening three heats eliminated Sheffield’s lead.
Yet Josh Bates took the chequered flag in heat five to bring them back on level terms on aggregate, and there remained nothing to separate the two sides over the next few races.
Bates was then joined at the front by reserve Arthur Sissis for a huge 5-1 in heat eight to give them an unlikely lead.
The home side quickly hit back and a string of level races ensured the teams were level heading into the final three races. Stuart Robson and Kyle Howarth then delivered a timely maximum in heat 13, taking advantage of bike troubles for the unbeaten Richard Lawson whilst leading on the final lap.
They still needed to prevent a Glasgow 5-1 in a nervy last heat to prevent a run-off, and Howarth duly came home in second place to wrap up a sensational success.
Stand-in skipper Howarth was again imperative to their success, whilst Barnsley ace Bates also took two vital victories when the tie was in danger of slipping away from them.
It was Aussie racer Arthur Sissis who perhaps made all the difference at reserve, however, as he bagged a crucial 12+1 point-haul to see his side over the line.
GLASGOW 48: Aaron Summers 14, Richard Lawson 11, Richie Worrall 9, Rene Bach 7+2, Nike Lunna 3+1, Danny Ayres 3, Fernando Garcia 1.
SHEFFIELD 42: Arthur Sissis 12+1, Kyle Howarth 9+2, Josh Bates 9, Stuart Robson 8+1, Cameron Heeps 3+2, Nathan Greaves 1, Simon Stead R/R.