Leinster now dangerously close to exiting PRO12 title race
Leinster's 25-22 defeat at the Dragons now makes them dangerously detached from the chase for the play-offs with eight points separating Matt O'Connor's side from fourth-placed Ospreys and only three games remaining.
It means they have to beat Ulster at the Kingspan in 11 days to salvage their PRO12 hopes and this only five days after they have travelled to meet Toulon in the Champions Cup semi-final. If ever Ulster are likely to come into a game against their bogey side carrying all the aces then this will be it.
Meanwhile, bonus point wins for all the top four sides have certainly kept things very tight, with just four points separating leaders Glasgow from Ospreys.
Ulster's 27-20 win in Galway wasn't enough to prevent them from slipping to third in the table after Munster thrashed Edinburgh 34-3 at Murrayfield. The southern province are still level on points with Neil Doak's squad - both have 63 - but move into second on a superior points differential of 180 to Ulster's 158.
As things stand, Ulster would lose out on a coveted home semi-final, but will ensure a play-off place with victory over Leinster.