REPORT: Wigan Athletic 1 Sutton United 1 (Sutton win 7-6 on penalties)
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The League Two outfit had given as good as they'd got during the 90 minutes, against a Latics side packed full of senior players.
Sutton had already hit the post through Joe Kizzi when they took the lead on the half-hour mark.
Latics gave the ball away cheaply and Will Randall slotted past Jamie Jones from close range.
James McClean levelled the scores with a rasping drive six minutes before half-time after good work from Tom Pearce.
But Latics couldn't force a winner in the second half, despite sending on Gwion Edwards, Max Power and Will Keane for the final quarter.
With no extra time, Power missed Latics' first spot kick in the shoot-out.
Goalkeeper Jones did his pal a favour by saving Sutton's second penalty, with Graeme Shinnie, Keane, McClean and Josh Magennis then scoring theirs.
Jamie McGrath made it 6-6, although Tendayi Darikwa missed Latics' seventh penalty to send Sutton to Wembley 7-6 on penalties.