The Brighton captain had helped his defence keep City at bay for 70 minutes, before Sergio Aguero broke the deadlock and then Dunk headed into his own net.
It meant Dunk became only the seventh player to score an own goal on his Premier League debut.
Dunk will be hoping for more luck when Brighton travel to Leicester City on Saturday.
|John Pemberton||SHU||MCI||Nov 1992|
|Chris Swailes||IPS||AVL||Apr 1995|
|Jacob Laursen||DER||MCI||Aug 1996|
|Richard Johnson||WAT||WIM||Aug 1999|
|Martin Cranie||SOU||CHE||May 2004|
|Dean Ashton||NOR||AVL||Jan 2005|
|Lewis Dunk||BHA||MCI||Aug 2017|