By Jack Gallagher Manchester United and Tottenham Hotspur will top the billing in the Premier League this weekend, with the two top four-chasing sides facing off at Old Trafford on Sunday. Both teams will head into the game in rather topsy-turvy form – as their current mid-table positions in the Premier League standings attest. With both sides in need of a win, here’s the three key battles you should keep an eye out for which could decide the game at Old Trafford. Manuel Ugarte vs James MaddisonAlthough Man Utd fans were disappointed with the 1-1 draw with FC Twente in midweek, they were impre…