It has been a difficult start to life as a Premier League manager for Russell Martin as his Southampton side have lost all three of their league games so far. A 1-0 opening day defeat to Newcastle United was disappointing for Southampton given they played the bulk of the game against ten men, but the subsequent league defeats to Nottingham Forest and Brentford have been more troubling. Against Forest Russell Martin watched on as his side mustered just one shot on target in another 1-0 defeat, whilst defensive mistakes were Southampton’s downfall in the 3-1 loss to Brentford in the last game be…