In a surprising turn of events, a second-minute own goal by Daniel Bachmann proved to be the winning factor as Sheffield United secured a 1-0 victory over Watford. This defeat ended Watford's perfect record this season and handed Sheffield United a crucial three points.
It could have been a more comfortable win for Chris Wilder's men, who saw Kieffer Moore miss a first-half penalty.
Watford went into the game having won all five league and cup games, including Championship victories over Millwall, Stoke and Derby.
United struck with less than 80 seconds on the clock when Callum O'Hare found his way past a defender on the right side of the area and saw his attempted cut-back go in off keeper Bachmann.
Vakoun Bayo spurned a good chance for the visitors when he chipped the ball wide after being put through on goal.
TrendingAn even better chance for the hosts was wasted in the 17th minute when they were awarded a penalty following Yasser Larouci's foul on Oliver Arblaster.
Moore saw his effort from the spot saved by Bachmann, diving low to his left.
Loanee Jesurun Rak-Sakyi, making his first league start for United, had an effort blocked inside the area, before Gustavo Hamer then saw his shot from distance saved by Bachmann.
A double substitution for Watford saw Kwadwo Baah and Daniel Jebbison sent on to replace James Morris and Bayo. It was a debut for Jebbison, who joined the Hornets on loan from Bournemouth on transfer deadline day after leaving Sheffield United earlier this summer.
Moore found a way through in the area and looked set to score but Bachmann recovered and turned his shot away.
A foul on Tom Dele-Bashiru in injury-time, which resulted in a yellow card for Hamer, sparked a melee involving a number of players from either side before referee Andrew Kitchen eventually restored order.