Quarterback Tom Brady (L) of the New England Patriots and teammates celebrate victory over the Seattle Seahawks in Super Bowl XLIX

Singer Katy Perry performs during the New England Patriots and the Seattle Seahawks Super Bowl XLIX halftime on February 1, 2015 at the at University of Phoenix Stadium in Glendale, Arizona.

Laura Urunova performs with dogs during the 4th New generation Monte-Carlo International Circus Festival in Monaco on January 31, 2015.

Pilot Skip Stewart of US performs a stunt during the Ilopango Air Show on air base in San Salvador on January 31, 2015.

Competitors walk on ropes as they take part in the “Tough Guy” adventure race near Wolverhampton, Staffordshire

Serbia’s Novak Djokovic poses with The Norman Brookes Trophy after victory in men’s singles final match against Britain’s Andy Murray

Serena Williams of the US (L) and Russia’s Maria Sharapova (R) hold their trophies after Williams won their women’s singles fina