Wayne Rooney described Manchester United's 3-0 defeat to Liverpool as one of the darkest days of his career.

Steven Gerrard scored two penalties and Luis Suarez was also on target as the Reds eased to their first victory at Old Trafford in five years.

The scoreline did not flatter Liverpool. It could have easily been five or six for Brendan Rodgers' side, who are now 14 points ahead of their old foes in the Barclays Premier League.

For a Croxteth-born man who started his career at Everton, losing to the Anfield club in a such a disastrous way was not easy for Rooney to take.

"It's one of the worst days I've ever had in football," said the United striker.

"You have to give Liverpool credit - they played well - but it's difficult to take. Nobody wants to lose, especially in this way, in your own stadium. It's not nice."

Rafael handled the ball in the United box in the first half and Gerrard converted.

The Liverpool captain scored his second from the spot when Phil Jones clattered into the back of Joe Allen.

Gerrard could have had a hat-trick of spot-kicks when Nemanja Vidic was dismissed for a foul on Daniel Sturridge in the box, but his effort hit the post.

Still, there was time for Liverpool to find a third in the dying minutes as Suarez beat David de Gea from close range.

"To go behind by one penalty was hard to take," Rooney said.

"We had a game plan for the second half, which went out the window when they got the second penalty so early on.

"It made it an uphill battle to come back. I thought after that we had a couple of chances where I thought if we got one we could have gone for a second and maybe we could have done it.

"Then, to concede a third penalty, even though they missed, was a big blow to us. We were then chasing the game with 10 men."

Vidic was unlucky to receive a second yellow as replays showed Daniel Sturridge appeared to dive, but Rooney had no complaints about any of the decisions.

"I haven't seen the penalties back again but from where I was standing on the pitch I don't think we can argue with them," the 28-year-old added.

Meanwhile, Liverpool captain Gerrard is adamant they are in the mix for the title.

"We've showed today that we are genuine contenders and we are going to fight to the end for this," said the Reds goal hero.

"We believe it. The rest of the teams around us have to believe we're going for it."