Southampton put in a battling display at The Emirates on Saturday before ultimately succumbing to a 3-1 defeat against Arsenal. Russell Martin was left feeling let down by his Southampton players after their 3-1 loss at Bournemouth on Monday night. However, it was a much improved performance against Arsenal as Southampton showed the fight that was sorely lacking against Bournemouth and defended very well for the most part. Some of that is down to the fact Martin set up with a back five to make the Saints harder to beat, with Kyle Walker-Peters playing as a centre-back for the first time in his…