Leicester Tigers ended the Ospreys chances of reaching the Heineken Cup quarter finals and kept their own chances alive with a 15 all draw against the Welsh region at the Liberty Stadium.
The result sets up a mouthwatering clash next week between Leicester and former Champions Toulouse at Welford Road in which a victory of any kind for the either team will make them pool winners.
The result in front of a 13,126 strong crowd also means that no Welsh region will be involved in the Heineken Cup finals this season.
The Ospreys took the early initiative with a try by Joe Bearman in the 31st minute following three early missed penalty shots from four by Dan Biggar.
Biggar managed to convert Bearman's try which gave the Ospreys a 10-0 lead heading for half time.
Just before the half way mark Toby Flood missed a drop goal but slotted a penalty which meant the Tigers went in for half time trailing 10-3.
Fifteen minutes into the second half Dan Biggar missed another kick at the posts for a penalty which would have been the first points of the second half.
Leicester took a step up after Biggar's miss and England fly half Flood made a classy break which put the Ospreys on the backfoot and Ben Youngs sniped and scored the visitor's first try.
Flood converted to level the scores but Leicester were in control and within five minutes Niall Morris scored the Tigers second try which meant that they had gone from trailing 10-3 to leading 10-15 as Flood missed the conversion.
With the Ospreys looking like they were headed for their first loss at the Liberty Stadium this season Eli Walker made a sensational break slicing through the Leicester defence which set up a try for Jonathan Spratt five minutes from time.
The Ospreys could have gone ahead with the conversion but Biggar missed his fifth shot at goal and the scores stayed level.
"We came here to win, and the overriding feeling is one of disappointment," said Tigers scrum-half Youngs. "Luckily Dan missed the kick at the end there.
"We're really disappointed. Next week's a bigger game again, there's everything to play for."
The Ospreys Kiwi scrum half Kahn Fotuali'i was awarded man of the match.
Final Score Ospreys 15 (10) Leicester 15 (3)
Tries: Bearman, Spratt
Tries: Youngs, Morris
Referee: John Lacey (Ire),
Assistant ref: Sean Gallagher (Ire),
Assistant ref: Kevin Beggs (Ire),
TMO: Marshall Kilgore (Ire),
Citing Commisioner: Iain Goodall (Sco)
Ospreys: Richard Fussell; Ross Jones, Thomas Isaacs, Andrew Bishop, Eli Walker; Dan Biggar, Kahn Fotuali'i (c); Ryan Bevington, Richard Hibbard, Adam Jones, Ian Gough, James King, Ryan Jones, Justin Tipuric, Joe Bearman.
Replacements: Scott Baldwin, Duncan Jones, Campbell Johnstone, Lloyd Peers, Sam Lewis, Rhys Webb, Matthew Morgan, Jonathan Spratt.
Leicester Tigers: Mathew Tait; Niall Morris, Manu Tuilagi, Anthony Allen, Adam Thompstone; Toby Flood, Ben Youngs; Marcos Ayerza, Tom Youngs, Dan Cole, Louis Deacon (c), Geoff Parling, Steve Mafi, Julian Salvi, Jordan Crane.
Replacements: Rob Hawkins, Logovi'i Mulipola, Martin Castrogiovanni, Ed Slater, Thomas Waldrom, Sam Harrison, George Ford, Matt Smith.