Arsenal was two points behind United, but has a game in hand over Chelsea. Arsenal are chasing a first league title since 2004.

Arsenal's Aaron Ramsey celebrates after scoring a goal against Portsmouth during their English Premier League soccer match at Fratton Park in Portsmouth December 30, 2009.

Arsenal's opening goal came from Eduardo's free kick, which took a huge deflection off defender Younes Kaboul to float past static goalkeeper Hermann Hreidarsson at the right-hand post. Samir Nasri scored another for Arsenal just before the break after receiving the ball from Aaron Ramsey's flick-on.

Ramsey scored himself in the 69th, taking the ball off Vanden Borre and charging past Frederic Piquionne before lashing in a left-foot shot from the edge of the box.

Nadir Belhadj pulled one back for Pompey but Alex Song's header from Nasri's right-wing cross killed off the match in the 81st with Arsenal's 51st goal of the season.

Arsenal's Sami Nasri (R) scores a goal against Portsmouth during their English Premier League soccer match at Fratton Park in Portsmouth December 30, 2009

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