Rovers were forced into one change for the game with Matt Mills ruled out through injury, he was replaced by Jos Van Nieuwstadt.
Rovers took an early lead when James Coppinger put them in front.
The afternoon went from bad to worse though after this, Jason Scotland equalise from the penalty spot on the half hour.
Rovers scorer James Coppinger was stretchered off shortly before half time and taken straight to hospital with what looked like concussion
Jordi Gomez then wrapped the game up for the Swans in the second half with two goals, in between the goals Rovers Richie Wellens was sent off for two bookable offences.
Rovers long unbeaten run comes to an end in devastating circumstances with the injury and the sending off on top of the defeat.
Swansea City – De Vries, Tate, Serran, Williams, Rangel, Britton, Allen, Gomez, Gower, Dyer, Scotland
Substitutes – Bessone, Tudur – Jones, Orlandi, Butler, Bauza
Doncaster Rovers -Sullivan, O`Connor, Van Nieuwstadt, Hird, Chambers, Coppinger, Woods, Spicer, Wellens, Stock, Heffernan
Substitutes – Lockwood, Wilson, Shiels, Byfield, Price
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