LONDON (Agencies) - Manchester United got their spluttering season back on track with a 2-0 win against Arsenal in the FA Cup quarterfinals at Old Trafford on Saturday. While United's morale will have been lifted by victory against a major rival, Arsenal's campaign is in danger of imploding. The Gunners now have only the Premier League title to aim for after a miserable two weeks which has seen them lose the League Cup final to Birmingham and crash out of the Champions League and FA Cup. United goalkeeper Edwin van der Sar admitted it was important for his team to get back to winning ways. "We got our goals, luckily I pulled off a couple of saves and we defended well," he said. "It was important of course because we lost to Chelsea and Liverpool so the gap in the league is now non-existent. We needed to win tonight for another chance of silverware." Fabio opened the scoring with a close-range finish in the 28th minute after Manuel Almunia could only push Javier Hernandez's header from a Rooney cross into the Brazilian's path. Arsenal's Robin van Persie, controversially sent off for kicking the ball away against Barcelona in midweek, almost equalised before the break but the Dutch forward saw his low shot turned away by Van der Sar. Laurent Koscielny was denied by van der Sar soon after half-time and United, who last won the Cup in 2004, took advantage of that escape to put the tie beyond Arsenal's reach in the 49th minute. Rafael da Silva's surging run and cross forced Johan Djourou into a block that looped the ball towards Rooney and the England striker headed past Almunia from a tight angle. There was more bad news for injury-hit Arsenal, already without Cesc Fabregas, Alex Song and Wojciech Szczesny, when Swiss centre-back Djourou was stretchered off with a shoulder injury in the closing stages. In the day's other quarter-final, Lee Chung-Yong fired Bolton into the FA Cup last four as the South Korean's late goal clinched a 3-2 win over Birmingham at St Andrew's. Owen Coyle's side looked to have been denied a place in the last four when Kevin Phillips hit a late equaliser for Birmingham, but Bolton midfielder Lee headed the winner in the 90th minute to send the visitors to the Wembley semis.