Leeds United take on Southampton in the Championship play-off final on Sunday at Wembley and Ross McCormack has given his prediction for the clash. With promotion on the line, Leeds go up against Southampton in a bid to join Leicester City and Ipswich Town in the Premier League at the first attempt after beating Norwich City in the semi-final last Thursday. Leeds are considered slight favourites having finished three points ahead of Southampton at the end of the regular season, but the Saints beat Leeds home and away including on the final day of the campaign. Plenty have already given their p…