Steven Fletcher's first goals for Sunderland ended Swansea's 100% start to the Premier League season in a dramatic 2-2 draw marred by a serious ankle injury to Neil Taylor.
Fletcher started to repay his big-money fee following his move from Wolves as he struck twice in the first half, either side of Wayne Routledge's effort for Swansea.
Michu scored his fourth goal in three games for the hosts to level matters, but they then lost defender Chico Flores to a red card for a wild high challenge as the game ended all square. But prior to all that action, Taylor had already been carted off on a stretcher after his leg buckled awkwardly under him following a challenge with Craig Gardner.
The incident could barely have come at a worse time for Swans boss Michael Laudrup, just a day after the transfer window closed.
The injury stunted Swansea's bright start and they contributed to Sunderland's opener after 40 minutes. Ashley Williams stubbed his back pass into the ground and Fletcher ran in on goal to despatch a superb low finish beyond Michel Vorm.
Swansea levelled as six minutes of stoppage time began.
Nathan Dyer and Routledge, who have started the campaign brilliantly, linked again as the former's scooped pass allowed the latter to flash home a volley.
But parity did not last to the interval as Sebastian Larsson's free-kick evaded everyone apart from Fletcher, who tapped home at the back post to give the visitors the half-time lead.
Michu found a second leveller after 66 minutes, Jonathan De Guzman's delivery was pinpoint and Michu's powerful header gave Simon Mignolet no chance.
Swansea's comeback efforts were stymied when Flores then saw red for a wild high-footed challenge that grazed substitute Louis Saha's head.