Sheffield Wednesday responded to the sacking of Tony Pulis by beating play-off chasing Middlesbrough 2-1 in the Championship.
Pulis left the club on Monday night having been in charge for just 45 days and 10 games - and less than 24 hours later the Owls recorded a victory under caretaker Neil Thompson.
First-half goals from Callum Paterson and Liam Shaw secured victory at Hillsborough, with the hosts holding on after Duncan Watmore pulled one back.
The win was relegation-battling Wednesday's second in three games.
Thompson, first-team coach under Pulis, made two changes from the side who drew with Blackburn on Boxing Day, bringing in Shaw for Joost van Aken and also handing a start to Kadeem Harris.
Middlesbrough manager Neil Warnock made one change from the team which beat Birmingham 10 days ago, with goalscorer Watmore one of those brought in.
The hosts had the first chance of the game in the third minute when captain Barry Bannan found Josh Windass, who fired wide of the far post.
Boro winger Marvin Johnson forced a save from 'keeper Keiren Westwood after being played in by Britt Assombalonga in the 25th minute.
Wednesday took the lead five minutes later when Liam Palmer found Paterson, who fired the ball into the bottom right corner.
The hosts doubled their lead in the 40th minute as Shaw scored his first senior Wednesday goal by tapping in from a Bannan cross.
Warnock's visitors were quick out of the blocks after the interval and Watmore pulled one back in the 49th minute. The Boro winger latched on to a Sam Morsy pass and found the back of the net.
Boro, chasing a fourth successive victory, pressed for an equaliser and substitute Marcus Tavernier had a good chance in the 71st minute but could only fire wide of the Wednesday goal.
The chances kept coming for Boro, with Johnson rattling a post a minute later.
Warnock threw on Marcus Browne and he had Boro's last chance of an equaliser but he hit low and wide of Westwood's goal as Wednesday held on for victory.
What the managers said…
Sheffield Wednesday's caretaker manager Neil Thompson: "I spoke to the chairman last night and he told me to prepare the team for today. You learn to expect the unexpected. Football never surprises me and you always have to be ready for anything.
"To come away against a good team with a result is really encouraging. We just wanted to be positive and the lads did as we asked."
Middlesbrough's Neil Warnock: "We're disappointed. The pitch was diabolical so everyone had to knock it long and it means you can't get much pattern into it. I can't blame the players for that. You just have to adapt to the conditions better. It's not very often we make defensive mistakes like that and I don't need to name names. They know who they are.
"We picked today's team before Tony (Pulis) had gone. In the circumstances, I thought we tried to play the ball well and be patient. We had the chances but we just couldn't take them. It's fine margins and I think they'll be delighted to get three points while two silly mistakes cost us."