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Port Vale produced a stunning second-half performance to claim all three points against a much-fancied Coventry City side.
Striker Callum Wilson gave the visitors the lead before a Tom Pope header levelled the match.
Minutes later Franck Moussa's stunning 30 yard strike gave Coventry City a half-time lead.
Micky Adams made two half-time changes, Chris Birchall and Ben Williamson were introduced and had a telling impact.
Captain Doug Loft linked up will with the two substitutes to level the match on the hour-mark.
Former Coventry City midfielder Birchall grabbed the winner on 83 minutes after combining well with Williamson and Pope to send Vale Park into a frenzy.
Watch Chris Birchall's interview in full on Valiant Player
or a short clip on our YouTube Channel.