Last Updated: 16/01/13 9:25pm
The referee blows his whistle for full-time. Arsenal have won 1-0 and will now travel to Brighton in the fourth round of the FA Cup.
Arsenal are ahead late in this game. They have missed plenty of chances but that won't matter if Wilshere's goal is enough to decide this clash.
GOAL WILSHERE! The goal finally arrives! Wilshere fires home a half-volley from the edge of the box to give Vorm no chance. Good work from Giroud to find the midfielder in space.
More drama from the corner as Giroud sees a powerful volley blocked by Dwight Tiendalli. Arsenal are becoming more frustrated.
Walcott's low effort is knocked away from goal by Vorm. Arsenal collect the ball on the right flank and the resulting cross is knocked behind for a corner.
Arsenal hit the post as Sagna's cross from the right evades Walcott and strikes the far post. Vorm collects the loose ball.
Giroud misses another chance as his low effort from inside the box is easily gathered by Vorm. Frustrating times for Arsenal.
Wilshere can't play Cazorla through on goal as his attempted through ball races out of play for a goal-kick.
Wilshere's driven effort from the edge of the box is punched away from goal by Vorm. The Swansea goalkeeper is pretty busy tonight.
Sagna is the latest Arsenal player to fire a shot at goal. This effort from the edge of the area goes high over the bar.
Walcott manages to create some space but the shot disappoints as he drags the ball wide of goal. The missed chances are adding up for Arsenal.
Giroud turns on the edge of the box but his shot is straight at Vorm. Another save from the Swansea goalkeeper.
Swansea look for a bit of quiet as they keep the ball at the back. It has been a dangerous few minutes from Arsenal so the away side need to keep it tight.
The resulting corner causes more problems for Swansea as a second effort is cleared off the line. Britton the man to get the credit this time.
A great decision from the referee as he turns down Arsenal's appeals for a penalty. Graham knocked the ball off the line with his chest - not his arm - and the Gunners have a corner. Walcott also saw a shot saved by Vorm.
Giroud finds space in the six-yard box but he can only send his header wide of goal. Again the striker should have done better with a chance.
Per Mertesacker and Vermaelen combine to create a slightly nervous moment for Swansea but the away side work the ball away from danger.
Leon Britton knocks Olivier Giroud's cross from the left behind for a corner. Swansea clear the resulting flag-kick.
The corner is cleared and that allows Walcott to break. A very quick run from the forward but he runs the ball out of place just after the halfway line.
Swansea enjoy some possession after that half-chance to threaten. Still plenty for the away side to feel optimistic about in this clash.
Graham can't find de Guzman free in the area as his pass from the left goes flying out of play for a throw on the opposite flank. Still Swansea threat on the break.
Giroud can't test Vorm as his volley from a tight angle goes wide of the Swansea goal. Arsenal creating quite a few chances now.
Cazorla makes some space on the edge of the box and fires a powerful effort just over the bar. Arsenal have started this half on the front foot.
The forward feels he was pushed by Chico before that shot. He has a point but the referee is quite clear that the advantage was played.
Walcott goes through one-on-one with Vorm but he can only divert his effort wide of goal. Should have done better.
A few half-time price boosts from Sky Bet. Arsenal to win 2-1 is available at 11/1 and you can get the same price for Swansea to win 1-0. Giroud to score next is 9/2 and Dyer is a 22/1 shot.
A great save from Vorm right at the end of the half to deny Vermaelen. He used his legs to stop the shot in the centre of the goal.
Sagna's cross from the right is met by Gibbs at the far post. His header creates a problem for Chico in the six-yard box but the defender does well to knock the ball clear.
A bit of frustration for Arsenal as Cazorla's effort fails to test Vorm. Will be interesting to see if the approach from the Gunners changes.
Vorm is alive to a little bit of danger and races out of his goal to knock the ball away from Giroud. The Swansea goalkeeper is always good at dealing with situations like that.
Walcott's effort is blocked to provide more frustration for Arsenal. The forward, despite his poor set-pieces, is the most lively player for the Gunners tonight.
Swansea are keeping men behind the ball to frustrate Arsenal. The Gunners are causing some problems but a bit more is needed.
The corner from the left is worked short by de Guzman but his resulting cross is too long and goes behind for a corner.
Good work from Vermaelen to block Dyer's shot and knock the ball behind for a corner. Swansea continue to produce problems on the break for Arsenal.
Wilshere's corner from the right is cleared by Bartley after a little bit of a scramble. Swansea's defence holds firm.
Swansea enjoy a spell of possession at the back. The Arsenal fans try to offer a bit of support but more is needed from the Gunners.
Diaby catches De Guzman with his arm to bring a break to the play. No action is taken and the Swansea midfielder is fine to continue.
Walcott's free-kick from the left is very poor and goes straight behind for a goal-kick. The forward's set-pieces have been awful tonight.
That chance should worry Arsenal. The hosts have been the better side but Swansea are posing a threat on the break.
Routledge's cross from the left is headed against the bar by Bartley from close-range. He should have scored so that's a lucky escape from Arsenal.
Dyer's low cross from the right is cleared away from danger by Sagna. Swansea are trying to enjoy some joy on the break.
Wilshere's corner from the right is half-cleared to Francis Coquelin on the edge of the box. The midfielder's effort causes Michel Vorm a slight worry but he gathers the ball at the second attempt.
Walcott stumbles right on the edge of the box and goes down after Chico's challenge. The referee takes his time but does give Arsenal the free-kick.
Graham sends a very poor effort wide of Szczesny's near post. No joy for the Swansea striker so far tonight.
Walcott's corner from the left is cleared by Richards at the near post. Poor set-piece from the Arsenal forward.
Abou Diaby's effort from the edge of the box is blocked by Kyle Bartley. Good work from the Swansea defender against his former club.
Thomas Vermaelen stops Nathan Dyer with a strong challenge in the box. The loose ball falls to Wayne Routledge and his progress is stopped by Bacary Sagna.
Arsene Wenger will be quite happy with how this match is going. Arsenal look the more lively and there hasn't been too much from Swansea in attack.
Arsenal enjoy another spell of possession. Swansea have Graham alone in attack so they are quite happy to have men behind the ball.
Giroud battles to find space on the left flank and his cross is cleared away by Chico. All Arsenal at the moment.
Giroud is once again in space in the box and his shot goes wide of the near post. The striker should be doing better with these efforts.
Walcott's cross from the right finds Giroud but the striker can only send his header wide of the near post.
Swansea keeping the ball at the back. Chico is forced to clear after Walcott puts him under some pressure.
Danny Graham finds some space way outside the Arsenal box and sends a wild effort well wide of Wojciech Szczesny's left hand post.
The action has started. The winner of this tie travels to Brighton in the fourth round of the FA Cup.
Matt Banks e-mails in to say: "Arsenal will have their work cut out tonight against a talented Swansea outfit. They will need to defend better than they did on Sunday & press Swansea from the off. This is our best chance of a trophy so really hoping for an early Gunners goal to settle the nerves."
Here's some news on the odds for the game from Nigel Askham of Sky Bet: "Having drawn 2-2 at the Liberty Stadium, Arsenal are strongly backed at 2/7 to qualify for the fourth round and are 8/15 to pull off the victory in 90 minutes. The Swans are out at 9/2 or 5/2 to qualify via extra-time or penalties. If you fancy home goals its 9/2 for Theo Walcott and Olivier Giroud to both find the net."
A bit more info about the teams: Olivier Giroud returns to the starting line-up for Arsenal. Theo Walcott looks set to switch back to the right flank, with Lukas Podolski dropping to the bench, while Per Mertesacker comes in for suspended defender Laurent Koscielny after his red card against Manchester City on Sunday. Swansea won 2-0 here in the Premier League on December 1, but make six changes from their last match, with striker Michu, who hit both goals in that victory, on the bench as Danny Graham leads the attack.
The Swansea team is: Vorm; Richards, Chico, Bartley, Tiendalli; Britton, Agustien, de Guzman; Routledge, Graham, Dyer. Subs - Tremmel, Monk, Davies, Ki, Shechter, Hernandez, Michu
The Arsenal team is: Szczesny, Sagna, Mertesacker, Vermaelen, Gibbs, Coquelin, Wilshere, Diaby, Cazorla, Walcott, Giroud. Subs - Mannone, Jenkinson, Santos, Ramsey, Oxlade-Chamberlain, Arshavin, Podolski