They started the year as favourites for the NRL premiership, but Wests Tigers will almost certainly start their Mad Monday celebrations next week after going down 44-20 to the Sydney Roosters at Allianz Stadium.
Requiring a win to move above Brisbane into eighth spot, Tim Sheens' side now need to topple second-placed Melbourne at Leichhardt on Saturday and hope lowly Penrith beat the Broncos at Suncorp Stadium 24 hours earlier to have any hope of playing in the finals.
A hat-trick from giant winger Daniel Tupou, in only his second NRL game, laid the foundations for the win as Brian Smith's side marked Anthony Minichiello's 250th game in style by running in eight tries.
The Tigers, who were without skipper Robbie Farah due to a broken hand, were never at the races in the first half as the Roosters opened up a 26-0 lead by the break - their highest-scoring opening period since round 18 in 2008.
Frank-Paul Nuuausala opened the floodgates in the 13th minute before Tupou grabbed his first, hauling in a Braith Anasta kick to the corner and brilliantly putting the ball down.