Diego Costa rescued a point for Chelsea as Swansea secured a 2-2 draw to end Antonio Conte's perfect start to the season as head coach.

Costa gave the visitors the lead at the Liberty Stadium in the 18th minute with his third goal of the season, as Chelsea went in search for their fourth win of the campaign.

Swansea turned things around after the break, with two goals in two minutes thanks to Gylfi Sigurdsson's (59) penalty and Leroy Fer's (62) opportunistic finish.

But Chelsea eventually rescued a point and ensured their unbeaten start to the season remained intact nine minutes from time as Costa, who was influential throughout the match, struck with an overhead kick.

The draw means Conte's side stay second but trail Manchester City two points after their victory in the Manchester derby on Saturday. Francesco Guidolin's sidemove up to 13th in the table.

Guidolin made two changes to the Swansea side that lost 2-1 to champions Leicester last time out, with Neil Taylor and Ki Sung-yueng coming in for Wayne Routledge and Modou Barrow.

The changes brought about a change in formation with Guidolin setting his side up in a 3-5-2 formation, but it was the unchanged Chelsea, who named new signings David Luiz and Marcos Alonso on the bench, who started the brighter of the two sides.

Willian gave Lukasz Fabianski an early test, firing a powerful shot straight at the Poland international, who palmed the ball to safety.

Willian was proving a real handful for Swansea, but was again thwarted by Fabianski who showed excellent handling skills to claim the Brazil international's cross with Costa waiting to pounce.

Chelsea were rewarded for their excellent start in the 18th minute when Oscar brought down Federico Fernandez's poor header before teeing up Costa, who fired into the bottom corner.

Swansea were struggling to make any impact until Fernando Llorente teed up Sigurdsson, who curled an effort wide of Thibaut Courtois' far post.

Guidolin opted for a change in formation before the break, introducing Barrow for Taylor just before the break as Swansea reverted to a 4-4-2 formation.

But Chelsea could have doubled their advantage seconds later as Terry flicked on Nemanja Matic's corner but Costa fired wide from a couple of yards.

Conte was becoming more and more frustrated by Chelsea's failure to grab a second goal and Swansea eventuall made them pay.

First, Sigurdsson levelled from the spot after Courtois bought him down with a rash sliding challenge, becoming Swansea's top Premier League scorer in the process with 26 goals.

And then Fer profited after Cahill, who thought he was fouled, was caught in possession with Dutchman squeezing the ball past Courtois and over the line.

Chelsea captain John Terry led the protests against the goal and Costa, having been booked in the first half, was perhaps fortunate to stay on the pitch after appearing to dive to win a penalty.

Oscar headed over from point-blank range as time ran out for the visitors, but Chelsea continued rto push forward.

And they salvaged a point in the 81st minute when Ivanovic's shot ballooned into the air off Jordi Amat and Costa struck in sensational style.

Player ratings

Swansea: Fabianski (7), Naughton (7), Fernandez (6), Amat (6), Kingsley (7), Taylor (5), Ki (6), Cork (7), Fer (8), Sigurdsson (7), Llorente (7).

Subs: Rangel (6), Barrow (7).

Chelsea: Courtois (5), Ivanovic (6), Cahill (6), Terry (7), Azpilicueta (6), Kante (6), Willian (7), Oscar (6), Matic (7), Hazard (7), Costa (8).

Subs: Fabregas (6), Moses (6), Batshuayi (N/A).

Man of the Match: Diego Costa

Teams

Swansea City Fabianski, Naughton, Fernandez, Amat, Taylor (Barrow 40), Ki, Cork (c), Fer, Sigurdsson (Rangel 88), Llorente, Kingsley
Subs Not Used Hoorn, Britton, Nordfeldt, Montero, Fulton
Booked Fer, Fernandez, Amat
Goals Sigurdsson 59 (pen), Fer 62

Chelsea Courtois, Ivanovic, Cahill, Terry (c), Azpilicueta, Kante, Willian (Moses 77), Oscar (Batschuayi 89), Matic (Fabregas 76), Hazard, Costa
Subs Not Used Begovic, Alonso, Pedro, Luiz
Booked Costa, Courtois, Hazard, Terry
Goals Costa 18, 81

Attendance 20,865

Referee Andrew Marriner