A defensive partnership is crucial to any team that strives to achieve anything in football whether it is to stay in the division or win the league.
Many will argue that keeping clean sheets in football is an art form and one to be admired, usually by Alan Hansen on Match of the Day.
Centre backs in constant communication playing attackers offside, blocking and tackling any potential threats and leaping above most to head the ball away from danger are just some of the attributes required to be successful.
One example of a defensive partnership doing better than most are Arsenals' own Per Mertesacker and Laurent Koscielny.
They can boast the joint best defensive record in the league to date and with the two of them playing next to one another, Arsenal have not lost in an incredible 28 games.
Mertesacker has looked twice the player from last season seemingly having adapted to the pace of the Premier League.
The German defender had been seen as something of a weak link in the Arsenal defence but Arsene Wenger's faith in his ability has been thoroughly justified this season.
A player with 95 international caps, his vast experience and leadership skills have been immense at the back for The Gunners.
Mertesacker's leadership had been lacking in this modern Arsenal side but his telling off of Mesut Ozil for not applauding away fans demonstrates how much of a professional sportsman he is and the London club are lucky to have him.
Koscielny on the other hand had been rumoured to leave the club this summer if Arsenal were unable to compete for honours.
Six months later and his team are top of the league with recent resilient away performances keeping their title hopes alive.
The French centre back will now be looking forward to a World Cup year thanks to his national sides' heroics to comeback from a two goal deficit against Ukraine.
Mertesacker and Koscielny look set to feature at home against Fulham next Saturday with three points expected to continue Arsenal's reign at the top of the league.
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