With only 10 games to go this season, rumours are continuously circulating that Arsenal are prepared to strengthen their front-line once the transfer window reopens. However, there are quarters of the Gunners fanbase that believe it is their defence that needs bolstering, which has seen the club linked with a move for Swansea City's Ashley Williams.
The 28-year-old is enjoying a successful campaign for the Swans under Michael Laudrup having helped them to 9th in the Premier League and a Capital One Cup winners' medal. It's no surprise that a number of England's bigger teams have cast envious eyes over the Liberty Stadium and the stats show that Williams would be an astute acquisition for Arsenal.
Starting with Arsenal's Big Friendly Giant, the pairing share similar stats, while Williams has started four games more – 23 to Mertesacker's 19 – the Swansea defender and the German have both kept a similar amount of clean sheets and conceded roughly the same amount of goals during their respective time on the pitch.
In terms of defending, it's Mertesacker that edges ahead of Williams in the win percentage ratio of 50-50's and aerial duels won.
While in terms of passing, Arsenal's Germany international again is the victor with a hight pass completion ratio and total accurate passes.
Up against Arsenal captain Thomas Vermaelen, Williams is the stronger of the two, despite starting two more games than the Belgian, keeping more clean sheets and conceding less goals per games in the Swansea back line.
In terms of defending, however, Vermaelen boasting the more impressive stats winning more aerial duels and with a higher tackle success percentage.
When it comes to passing, it is Williams who edges ahead of his Arsenal counterpart. Despite having a lower pass completion percentage – 87% to Vermaelen's 88% - the Swansea defender has attempted more passes in open play – 142 – and with a higher accuracy.
Up against Koscielny, Williams has started significantly more Premier League games than the Frenchman – 23 to 9 – and it's no surprise that the Swansea defender has kept far more clean sheets, although the stats show the Wales international concedes less goals per game than his French counterpart.
Defensively, it can be argued that Koscielny edges ahead of Williams, with a higher tackle and aerial duel completion, although he has attempted far fewer aerial duels when compared to the Swansea man.
In terms of passing, it's no shock to see that Williams is the better of the two, with a higher pass completion and with a higher accuracy.
Williams' stats across Swansea's Premier League campaign show that he would make a fine acquisition for Arsenal, especially if manager Arsene Wenger is keen on bolstering his defence before the close of the window. With Sebastian Squillaci the centre-back in reserve should the aforementioned trio pick up an injury or suspension, bringing in the 28-year-old could be a wise move for the Gunners.
Statistical comparison came courtesy of EPL Index