Cape Town - Chelsea saw their perfect start to the new season ended by Swansea on Sunday as Diego Costa netted a late equaliser to clinch a 2-2 draw at the Liberty Stadium.
The Blues dominated proceedings in Wales and they took just five minutes to register their first shot on target, Willian seeing his venomous strike from inside the area parried behind by Fabianski.
Willian was threatening again on 11 minutes with a dangerous ball across goal that Fabianski managed to cut out, but the visitors broke the deadlock just seven minutes later as Costa received the ball from Oscar inside the area before burying his hot into the corner of the net.
The Polish keeper had to be alert to prevent his team from falling further behind two minutes later when Eden Hazard raced through on goal, before the Belgian winger drew another fine save out of Fabianski on 34 minutes with his shot from a narrow angle.
Sigurdsson had the home crowd on their feet momentarily on 41 minutes when he lined up a shot from distance that missed the target by inches, while at the other end Costa should have done better when he failed to score from close range following a corner.
Willian had Fabianski worried just two minutes into the second half with his effort from the right after cutting inside, but the ball flew narrowly wide.
Kyle Naughton was then presented with a rare chance for the hosts after the ball fell to him just outside the area, but he failed to test Thibaut Courtois with a first-time half-volley.
However, the Swans were handed a way back into the contest on 58 minutes when Courtois conceded a penalty after he was adjudged to have fouled Sigurdsson as the home team broke up field.
The Icelandic playmaker took the spot-kick himself and made no mistake from 12 yards out, his 26th Premier League goal for the club making him their all-time top scorer.
The west Londoners needed a response but instead they shipped another goal three minutes later as Fer capitalised on a mistake from Gary Cahill to beat Courtois from inside the box.
Oscar almost found the equaliser soon afterwards as he looked for the far top corner of the goal with a curling shot, but Fabianski pulled off a super save at full stretch to keep out the Brazilian, who then steered a header over the crossbar from Cesc Fabregas' cross with 11 minutes remaining.
The Blues continued to press and they were rewarded on 81 minutes when Costa struck from close range with a scissors-kick after Branislav Ivanovic's initial shot had been deflected into his path.
The temperamental Spaniard was denied his hat-trick three minutes later as Fabianski produced yet another fine save to keep out his blistering effort and earn the Welsh outfit a point.