'You’re getting sold in the morning' was one of the chants sung from Luton fans, who were in raptures after their team went ahead for the first time through Reece Burke's second-minute header.
A goal at the start of the second half of extra time earned Middlesbrough a 1-0 win over Tottenham in the fifth round of the competition on Tuesday.
Nottingham Forest will go into the fifth round after ousting Leicester 4-1 on Sunday, having previously eliminated 14-time winner Arsenal.
Manchester United made an embarrassing early exit from the FA Cup after losing to second-tier side Middlesbrough in a penalty shootout at Old Trafford.
McTominay met a curling cross from fellow midfielder Fred with a glancing header in the eighth minute to seal a home match against second-tier Middlesbrough in the fourth round next month.
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It's only the second time in 26 seasons that Arsenal has fallen at the first hurdle.
Anthony O'Connor's first-half goal had the League One side - 59 places below their hosts on the football ladder - dreaming of the most famous result in their history, but a late blitz spared Spurs' blushes.
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City was still able to deploy a lineup packed with international players including the first three scorers — Bernardo Silva, Gabriel Jesus and Ilkay Gundogan.
Seven players were sent into isolation as well; assistant coach Rodolfo Borrell to step in as stand-in manager for the third-round FA Cup match on Friday night.
It was a sensational way to win the FA Cup for the first time in Leicester's 137-year history, 1-0 against Champions League finalist Chelsea.
The jeering was heard over some applause as more than 20,000 supporters were allowed inside Wembley Stadium after producing negative coronavirus test results.
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Iheanacho's brace on the night shows the exit door to Manchester United from this season's FA Cup.
Chelsea took the lead in the 24th minute when it was yet to register a shot on target against the Premier League's last-place team.
The goals came late through Ilkay Gundogan in the 84th minute and Kevin De Bruyne in the 90th.
Southampton also reached the semifinals in 2018, losing to Chelsea.
Chelsea remained undefeated in five games under Thomas Tuchel, but was made to work hard for the win against a team that is 13th in the second-tier Championship.
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