Signed by the 20-time major champion himself for Anna Wintour and her daughter, the racquet is expected to sell for more than $100,000.

The 18-year-old said he met Federer for the first time last year, while he has practiced with Wawrinka as the pair share the same management team.

From a colorful tour-wide trend to a headline-grabbing 'super suit', here are the looks that kept us talking this season.