Southampton enjoyed a relatively comfortable afternoon’s work in the third round of the FA Cup on Saturday, as they beat League Two Walsall 4-0 at St Mary’s. Russell Martin used the game as an opportunity to heavily rotate his side and the performance of a number of players showed that they should be a big part of the manager’s plans moving forward. Debutant Joe Lumley did well in goal, with his footwork earning praise post-match, whilst Jack Stephens completed his first game since returning from a lengthy injury. Sam Amo-Ameyaw and Jayden Meghoma took their opportunity, putting in solid perfo…