Relegation battling Wigan Athletic threw the Premier League title race wide open with a shocking 1-0 victory over Manchester United on Wednesday, even as Manchester City cruised to a 4-0 win against West Bromwich Albion.

Just a few days after United seemed to have landed a 20th league title by opening up an eight point lead over City, Wigan caused one of the biggest upsets in their history, suggesting the title battle may have a few more twists to go.

After City's win over West Brom, United's lead at the top has been reduced to five points with five games remaining and with a Manchester derby at Eastlands scheduled on 30 April, Sir Alex Ferguson's side has no margin for error in their remaining fixtures.

United were fortunate not to fall behind earlier in the game, after Wigan had the ball in the net midway through the first half but Victor Moses' header from a corner was ruled out for Caldwell's foul on De Gea. The Wigan players and fans were furious over the decision and replays showed they had a valid case, again. However, the hosts took the lead they deserved five minutes into the second half when Shaun Maloney curled one past De Gea, following a smart short corner routine with Moses.

United responded well to the goal and had a penalty shout waved off after the ball struck Maynor Figueroa on the arm inside the box.

Wigan had chances to double their lead when United streamed forward looking for an equaliser but De Gea pulled off a couple of good saves to keep the Red Devils in the match. In the end the home side managed to hold on to their one goal lead and boss Roberto Martinez hailed a "historic" result - Wigan's first ever Premier League win over United.

City Fight to Keep League Race Alive

Meanwhile, City bounced back from Sunday's 1-0 defeat against Arsenal by hammering West Bromwich Albion 4-0. The game included Carlos Tevez's first league goal in almost a year.

City took the lead in the sixth minute when Sergio Aguero was given space and he easily found the net from outside the area with a powerful low shot that beat Ben Foster. West Brom managed to avoid further damage in the first half but Roberto Mancini's side extended the lead after the break as Aguero converted a Nasri pass. City sealed all three points when a Tevez shot found the net, thanks to a deflection off Nicky Shorey. However, City kept on attacking and added one more as David Silva chipped the ball calmly over Foster, making it 4-0.

City have 74 points from 33 matches and will play Norwich away on 14 April, while United have 79 points and will welcome Aston Villa to Old Trafford on 15 April.

Manchester United's Hernandez shoots against Wigan Athletic during their English Premier League soccer match at the DW Stadium WiganReuters
Wigan Athletic's Alcaraz challenges Manchester United's Rooney during their English Premier League soccer match at the DW Stadium WiganReuters
Wigan Athletic's Maloney scores against Manchester United during their English Premier League soccer match at the DW Stadium WiganReuters
Manchester United's Hernandez, Carrick (2nd L) and Rooney prepare to restart during English Premier League soccer match against Wigan Athletic in WiganReuters
Manchester United's Jones and Giggs appeal for penalty against Wigan Athletic during their English Premier League soccer match at DW Stadium WiganReuters
Manchester City's Richards challenges West Bromwich Albion's Shorey during their English Premier League soccer match in ManchesterReuters
Manchester City's Aguero celebrates goal against West Bromwich Albion during English Premier League soccer match in ManchesterReuters
Manchester City's Sergio Aguero scores his second goal against West Bromwich Albion during their English Premier League soccer match in ManchesterReuters
Manchester City's Tevez celebrates his goal against West Bromwich Albion during their English Premier League soccer match in ManchesterReuters
Manchester City's Silva scores against West Bromwich Albion during their English Premier League soccer match in ManchesterReuters