Scottish Cup: Celtic through after bizarre night at Rugby Park

Celtic survived a blackout, a downpour and the threat from Kilmarnock's young chargers to power into the fifth round of the Scottish Cup at Rugby Park.

In a night of high drama the game only just went ahead following three pitch inspections by Hugh Dallas after heavy rain and then a power-cut delayed the kick-off by 45 minutes.

It also took Celtic some time to flicker into life after half-time - but an own goal from Garry Hay and Henrik Larsson strike kept their burning Treble ambitions alive.

Martin O'Neill's men now face another all-Premier League tie at Aberdeen in the last eight - but this game did not look possible after the worrying events before kick-off.

It took 20 minutes for the game to come to life when Stilian Petrov squandered a glorious opportunity to put Celtic ahead. John Hartson played the ball back to Larsson, who picked out the unmarked Bulgarian in the centre, but he powered his header just over the bar from just six yards.

Celtic needed a vital clearance from Thompson in the 43rd minute to save his side a late blow before the break as he cleared Johnson's header from Murray's corner off the line.

The visitors, however, got their noses in front just six minutes after the restart. Thompson swung in a free-kick to the near post where Larsson was lurking, but it was Hay's outstretched boot which made contact and sent the ball into his own net.

Kilmarnock looked shellshocked and the visitors almost doubled their lead two minutes later. McNamara swung in a great cross, but Petrov just could not make up enough ground and was stretching as he headed over the bar.

Larsson tried to kill off the tie in the 57th minute as he outstripped Frederic Dindeleux for pace, but he dragged his shot into the side-netting from a wide angle.

The Swede, however, did double Celtic's lead in the 63rd minute when Thompson chipped the ball over the Kilmarnock defence and he took one touch before dispatching the ball low past Marshall.

Kevin McGowne whistled a long-range free-kick past the post before Thompson's chip glided just over the bar.

Larsson could have capped off the win with his second late on as he headed substitute Bobby Petta's free-kick straight at Marshall.

Kilmarnock could have got a consolation in the dying seconds after Douglas had saved Johnson's shot, but Kris Boyd blazed wide from the rebound with the keeper grounded.