DEMBA BA completed his week of heroics by scoring the winner at the Liberty Stadium, keeping Chelsea just two points behind Liverpool in the title race.
The Senegalese striker latched onto Nemanja Matic’s wonderful long-range pass, before cutting inside Ashley Williams and drilling past Michel Vorm in the 68th minute.
With Liverpool’s thrilling 3-2 win over Man City earlier in the day, Jose Mourinho made five changes to the team that dramatically overcame Paris St-Germain on Tuesday night.
It was Ba’s first Premier League start since October, with Mohamed Salah replacing calf strain victim Eden Hazard.
But Chelsea were made to work hard for their victory, despite facing 10 men for most of the match.
In a quiet first half, two quick fire bookings saw Swansea defender Chico Flores sent off in the 16th minute – his second dismissal in a month.
Salah missed two great chances whilst, at the other end, Petr Cech pulled off a fine save from Wilfried Bony’s powerful header.
Mourinho brought on Oscar and Samuel Eto’o at half-time, as the Blues looked to take advantage of their extra man.
Immediately, their attacking domination intensified, with Ba glancing a header wide and Eto’o fluffing a golden opportunity.
Of their 26 shots in total, Ba’s goal was one of only three on target and, soon after, he held off Jordi Amat only to blaze over the bar.
Swansea remain in 15th place, just three points off the relegation zone, but couldn’t prevent Chelsea’s watertight defence keeping their 16th clean sheet of the season.
By grinding out another win, Mourinho’s men will be confident of doing the same at Anfield in two weeks time – a match that will surely decide the fate of this season’s Premier League trophy.