Heineken Cup: Ospreys 15-15 Leicester Tigers By James Standley BBC Sport Leicester face a winner-takes-all-clash against Toulouse on the final weekend after a thrilling draw at Ospreys that ends the hosts' Heineken Cup campaign.
Joe Bearman's try and a conversion and penalty from Dan Biggar made it 10-0.
Toby Flood cut the gap to 10-3 and his conversion levelled matters after Ben Youngs went over with 13 minutes left.
Niall Morris's unconverted try put Leicester in front but Jonathan Spratt scored out wide and Biggar's conversion to win the match drifted just wide.
Biggar missed four tricky kicks in all, and he was just inches wide from securing a dramatic victory in a game the hosts dominated for long periods.
The result means Ospreys cannot reach the knockout stages but it means Leicester will host Toulouse next Sunday knowing that victory over the French giants while denying them a losing bonus point will mean the Tigers will top Pool Two, although a home quarter-final is now out of reach.
It was another thrilling instalment in the on-going Heineken Cup battle between Ospreys and Leicester.
Ospreys have not played anyone more often in Europe's club showpiece, while the Tigers have only met Leinster more frequently, and the draw is the second time they have finished level in eight meetings.
The two main contenders for the tight-head berths in the Lions next summer, Ospreys' Adam Jones and Leicester's Dan Cole, were in action and it was the Welshman who drew first blood, causing Tigers loose-head Marcos Ayerza to fold in.
However, Biggar missed the resulting penalty and he failed with two more difficult attempts - hitting the bar with one long-range effort - as the hosts failed to make the most of their early pressure.
They finally broke the deadlock just before the half hour mark when a break from Ospreys' classy Samoa scrum-half Kahn Fotuali'i earned the hosts a much simpler penalty and this time Biggar bisected the posts.
Despite the minimal scoring both sides were playing with real adventure but the hosts, helped by their excellence at the breakdown, were clearly on top and Mathew Tait had to make two important tackles to halt threatening Ospreys attacks.
The former England man, back on track after a long term injury, then escaped without punishment after contact with Justin Tipuric, who had broken through and chipped over the full-back, saw the home fans howling for a penalty.
But they did not have to wait long for the first try and it was a dazzling score, sparked once again by Fotuali'i with a punchy break before feeding the supporting Tipuric.
The open-side threw out a fine pass to Ryan Bevington and although the Leicester cover got across, the loose-head prop popped the ball to number eight Bearman to cut back against the grain and finish in style, with Biggar converting.
Flood popped over a penalty to make it 10-3 at the break and the hosts suffered a blow as Wales back-five forward Ryan Jones went off with a damaged thumb.
He was later joined by hooker Richard Hibbard, who went off nursing his arm in the latest in a series of injury blows for the Grand Slam champions.
Leicester were under the cosh but when Biggar hit the woodwork for a second time - his fourth penalty miss in all - it gave Leicester a glimmer of hope and they finally clicked into gear as Youngs sniped over after a sweeping attack.
Flood converted and although the visitors suffered a major blow as centre Manu Tuilagi went off injured they quickly scored their second try.
Anthony Allen was hauled down just short but when the Tigers recycled the ball Niall Morris dived over in the corner for an unconverted score.
However, Ospreys were not finished and a searing counter-attack from young wing Eli Walker carried them deep into Leicester territory before Spratt dived over in the corner.
Biggar's conversion was fractionally wide and the draw means Leicester go into a Pool Two decider against Toulouse on the final weekend knowing the last eight is in reach.
Team line-ups
Ospreys: Richard Fussell; Ross Jones, Tom Isaacs, Andrew Bishop, Eli Walker; Dan Biggar, Kahn Fotuali'i (capt); Ryan Bevington, Richard Hibbard, Adam Jones, Ian Gough, James King, Ryan Jones, Joe Bearman, Justin Tipuric. Replacements: Scott Baldwin, Duncan Jones, Campbell Johnstone, Lloyd Peers, Sam Lewis/Jonathan Thomas, Rhys Webb, Matthew Morgan, Jonathan Spratt. Leicester Tigers: Mathew Tait, Niall Morris, Manusamoa 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 Referee: John Lacey (Ireland)
Replacements: Scott Baldwin, Duncan Jones, Campbell Johnstone, Lloyd Peers, Sam Lewis/Jonathan Thomas, Rhys Webb, Matthew Morgan, Jonathan Spratt. Leicester Tigers: Mathew Tait, Niall Morris, Manusamoa 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 Referee: John Lacey (Ireland)