Wales rescued an incredible last-gasp 31-24 win against Scotland in their last championship game in Cardiff.
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Friday's last-gasp 21-20 semi-final victory at Harlequins was the Falcons' third win in a row.
Rangers could even have snatched a last-gasp victory when midfielder Steven Davis struck the post.
Sean St Ledger put the Republic 2-1 ahead on 87 minutes before Alberto Gilardino's last-gasp equaliser.
And Bristol held on for the vital win when Myler's last-gasp drop-goal drifted wide of the posts.
Kevin Cassidy netted to put Donegal in front while Enda Lynn squandered a last-gasp chance to equalise.
Sheffield United striker Carl Asaba grabbed a last-gasp equaliser to save the Blades' blushes against lowly Wimbledon.
After Warwick's third penalty, the Ospreys forced a last-gasp chance but Shane Williams' drop goal flew wide.
Yet it was not enough as McGuire crashed over in the final minute to snatch a last-gasp victory.
Wales international Evans, 19, played a key role in the last-gasp goal that levelled the tie on aggregate.
Derick Hougaard then made it 21-12 with a penalty, but Thomas's last-gasp drop-goal gave Leeds a losing bonus point.
Elsewhere, in Group B Australia edged out India 4-3 with a last-gasp strike from Michael Brennan braking the deadlock.
Substitute Chris Iwelumo's last-gasp equaliser rescued Stoke a deserved point at Selhurst Park.
After the break, Howard Beverland's last-gasp challenge prevented Halliday from completing a hat-trick.
The Edinburgh side took the lead soon after his dismissal but were pegged back by a last-gasp equaliser from Rangers.
South Korea's last-gasp winner left Choi Kang-Hee's side three points ahead of third-placed Iran, with both teams having played five matches.
Huddersfield hero Gavin Clinch scored a last-gasp try and field goal to give the Giants their first points in the Superleague.
Inter boosted their hopes with a last-gasp 2-1 win over Udinese on Saturday to shrug off a previous defeat to Sampdoria.
Napoli needed a last-gasp equalizer from Mariano Bogliacino which came five minutes into time added on to deny Cagliari in Sardinia.
Both teams made wholesale changes from the second Test in Pretoria which the world champions snatched with a last-gasp penalty from Steyn.
And bottom side Zaragoza continued their good recent form as a last-gasp Apono penalty gave them a 1-0 win over Atletico Madrid.
Falcons have won three straight games as they prepare to face Gloucester in Sunday's final, including a last-gasp semi-final victory against Harlequins.
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London Irish centre Catt, who will win his 73rd cap, came off the bench in England's last-gasp win against Australia in the 2003 final.
Nuneaton-born Whittingham coolly converted, but there was still time for David Bell to head against the bar as Coventry pressed for a last-gasp equaliser.
Wales lost the first Test in Sydney to a last-gasp try, before being overrun in Brisbane in the second Test following the half-time break.
The Fijian wing cut inside to feed McLaughlin and although Noon put in a brave last-gasp tackle, the substitute was just able to touch down.
He held off a last-gasp charge from Belgian driver Francois Duval, who just missed out on a podium place after making up a 20-second deficit.
When the fourth official indicated four minutes of injury time it was Villa who seemed most likely to go on and snatch a last-gasp winner.
However, Vastic's last-gasp spot-kick ensures both these two sides, as well as Germany, still have a hope of joining Croatia in qualifying from Group B.
McCormack's 19th goal in his first full season in English football was the Scottish international's ninth successful penalty and third last-gasp strike in four Cardiff games.
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