Plucky Oxford City's FA Cup dream ended in tears as Ryan Austin spared Burton's blushes with a last-gasp goal to snatch a dramatic 3-2 triumph.
In the fifth minute of added time, the Southern League side had defender Andy Ballard sent off for a second bookable offence and, from Michael Simpson's free kick, full-back Austin stole in to head the winner off a post.
Oxford's part-timers made a dream start by taking the lead after only six minutes when goalkeeper Artur Krysiak allowed an 18-yard shot from former Burton midfielder Michael Alexis to slip through his hands.
But the League Two side were back on level terms inside eight minutes courtesy of a Shaun Harrad penalty after the striker had been flattened by City full-back Michael Perpetuini.
Burton's improving form was rewarded by a second goal on the stroke of half-time when Michael Simpson's pass split the Oxford defence for Jacques Maghoma to slip a close-range shot past Richard Knight.
But Oxford refused to lie down and fought back to equalise in the 55th minute when midfielder Jamie Brooks powered home a 12-yard header from a Mark Janes cross. But Austin had the final say deep into injury time.
