Reigning RaboDirect PRO12 champions Leinster withstood a late onslaught from Newport Gwent Dragons to edge a much-needed 23-19 victory at Rodney Parade.
Dragons led 10-6 at the break through a superb try by Ross Wardle, which came at the end of a flowing move by the Welsh side. Out-half Jason Tovey converted, while Tom Prydie stroked over a penalty.
Two penalties from outhalf Jimmy Gopperth kept Leinster in touch.
After the break the Irish side established their dominance on the game as Dragons saw second row Adam Jones sin binned for taking out the lifter at a line-out.
With a man advantage Leinster crossed for tries through Aaron Dundon and Noel Reid, both of which Gopperth converted to add to an earlier penalty.
But Dragons very nearly stole victory late on with a hugely spirited and skilful display. A Tovey penalty reduced arrears to just four points before scrum-half Jonathan Evans had a try disallowed just before the final whistle.
The Achilles heel of the Dragons, their set-piece, was hammered in the opening moments and Leinster's second row pair of Quinn Roux and Tom Denton began to stamp their mark on the line-out situation.
Yet, with bravery, the home side kept out the Leinster threat as the game stagnated for half an hour.
Former Newcastle stand-off Gopperth was the first half star as he booted a neat 30-metre penalty, his second attempt at goal in the game, to put the visitors ahead - although the home fans were not pleased by some of the decisions going against them during the period.
But, if Gopperth had a good half for Leinster, Prydie was the Dragons' hero.
He posted a penalty from 45 metres to tie the scores up at 3-3 after 15 minutes and was part of the brilliant move that saw Wardle cross from a move from halfway.
The final ten minutes of the half were the most lively as Prydie tried another long-range penalty but saw it go wide before Gopperth landed his second penalty to reduce the arrears to four points.
Tovey restored the home side's seven-point with a ten-metre penalty when Leinster strayed offside.
It signalled a ding-dong half in which Gopperth got Leinster back into the match with another penalty as they fought to regain the initiative.
The Dragons' fortunes were not helped by the loss of lock Jones for ten minutes in the sin-bin when he was accused of taking the man out of a line which, within minutes, saw Leinster take the lead for the first time.
They pounded the home line and, when hooker Dundon surged through a pile of bodies, the television official decided he had got the ball down, leaving the conversion easy.
It seemed Leinster had wrapped up the game and that the Dragons would not even get a losing bonus point for their efforts when centre Reid finished off a sparkling move down the left from half-way.
But the Dragons would not give up and Tovey punished the Irishmen's mistakes with two further penalties before the Welsh side were camped on the opposition line in the dying moments but could not get over for the crucial try to win the game.