Ten-man Marcham upset the formbook as the Division 1 strugglers edged to a dramatic 5-4 penalty shoot-out win against Reading League side Newbury in the Reading Intermediate Cup.
With the sides locked at 3-3 after extra time, it was Marcham, with only one win in the league this season, who held their nerve to make round four.
John Christiansen, Dave Tunnah and Lewis Hill had scored for Marcham in normal time.
Blewbury fought back to beat ten-man Harwell Village 6-5 in extra time.
With 12 minutes to go, and leading 5-2, it looked as though Harwell were going through only for Blewbury to hit back in devastating style.
A John Willis hat-trick, a Matthew Aplin and an own goal made up Harwell's tally.
Earlier, Harwell's Micky Rouse was sent off for denying a goalscoring opportunity just before the end of normal time.
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