Everton's Gylfi Sigurdsson piled the pressure on former manager Paul Clement with a brilliant strike in a 3-1 victory that leave Swansea rooted to the bottom of the Premier League.
The Iceland international, who left the Swans in a £45million summer move, scored Everton's second goal after Dominic Calvert-Lewin had cancelled out Leroy Fer's opener by converting Wayne Rooney's saved penalty on the stroke of half-time.
Rooney then made sure of the points with his sixth goal in five games when the hosts were controversially awarded a second spot-kick in the 72nd minute.
It left Clement, who took over on January 3 with the club bottom of the table and guided them to safety, battling to save his job as shot-shy Swansea currently have a similar record to the one which led to Bob Bradley's sacking almost a year ago.
Swansea are the odds-on favourites at 1/4 in Sky Bet's relegation odds.
Just 12 points from 18 matches, and more worrying just 10 goals scored, leave the Welsh club four points from safety after just one win and four points from their last 10 league matches.
The opposite is true for Everton, who are upwardly mobile under new manager Sam Allardyce with four wins and a draw from his first five matches in charge, earning 10 out of 12 points to lift his side from relegation contenders to ninth place in less than three weeks.
Clement is the 6/4 second-favourite with Sky Bet to be the next Premier League manager to leave his job.
Stoke boss Mark Hughes is the 4/7 favourite in that market.
Post-match reaction
Swansea manager Paul Clement insists his situation is no different from when he took over at the start of the year with the club in trouble.
"I see the situation as when I took over on January 3, 12 points from 18 games," he said.
"We have an opportunity to get to 15 at the halfway point, which would be a better situation. That is what I have to focus on."
Everton manager Sam Allardyce admits he is not getting too carried away with his side's good form.
Asked what the target is for his Toffees, Allardyce told Sky Sports: "Top half, I think.
"We're not getting too carried away.
"Delivering 13 points from a possible 15 is an outstanding feat from where we came from and what position we were in.
"I watched the West Ham game and that got us off to a good start, winning 4-0. We've scored 11 goals in the last five games and we've kept a number of clean sheets.
"I'm hugely disappointed we conceded from a corner but we recovered from that.
"To come from 1-0 down to win shows a lot of character which maybe was missing before I got here but the character was there today when we needed it."