John Cena injured at a live event in Madison:

At the start of the main event for the show, John Cena suffered a pretty severe blow to the head during his No Holds Barred match with Bray Wyatt. The referee threw up the "X" symbol and two trainers came out to check on him. This went on for several minutes. Cena basically worked the rest of the match - which was said to be very physical and involved a lot of foreign objects - with one good eye. After the match he headed straight to the back, without giving the usual "thanks for coming" talk to the live crowd, and celebrating with them. 

Source:WrestleZone.com