Ospreys still have a mathematical chance of reaching the play-offs with a top eight finish but it is very much a long shot.

On paper they have the easiest final game of all the contenders with four points separating five teams.

They must take a bonus-point win over Cardiff on Judgement Day - 1 June - and then hope the rugby gods are on their side.

Munster, Bulls, Leinster and Glasgow are guaranteed a top-four finish and with it, a home quarter-final. Stormers are also into the play-offs.

Ulster are just behind but travel to leaders Munster on the final day and could yet drop out of running.

The teams in eighth and seventh can take points off each other when Benetton welcome Edinburgh, ninth-placed Lions travel to Cape Town to face Stormers while Connacht, in tenth, head to Leinster.

And with four points separating five teams, everything could change.

"It's a tight league and the sponsors and television guys are loving it but we would have preferred to have it done and dusted. But that is not the way it works," said Ospreys head coach Toby Booth after the 26-13 win over Dragons.

"If we don't get into the play-offs it won't be because of what has happened in the last two weeks.

"If we get what we want it would have been what has happened previously. There will be certain points where we might have let a point here or there go begging."

Matters will get even harder if Sharks lift the European Challenge Cup on Friday night and with it, one of the URC's eight places.