Staff members of Mercedes AMG Petronas F1 Team spray German driver Nico Rosberg (C-R) and his wife Vivian Sibold with champagne as they celebrate at the end of the Abu Dhabi Formula One Grand Prix at the Yas Marina circuit on November 27, 2016. Nico Rosberg won his maiden Formula One world title by securing second place behind his Mercedes arch-rival Lewis Hamilton in the Abu Dhabi Grand Prix. Andrej ISAKOVIC / AFP

Argentina's Juan Martin Del Potro reacts after winning a point against Croatia's Marin Cilic during their Davis Cup finals tennis singles match in Zagreb, Croatia, Sunday, Nov. 27, 2016. (AP

Conor McGregor knocks out Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP)

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