Roger Federer Collection at Christie's in London

LONDON, UNITED KINGDOM - JUNE 21: Staff members adjust a Nike sneaker which is part of Roger Federer's signed champion outfit and racket from 2009 French Open (est. £50,000-70,000) during a photo call for 'The Roger Federer Collection: Sold to Benefit The RF Foundation' Evening and Online Sale at Christie's auction house in London, United Kingdom on June 21, 2021. The collection celebrates Federerâs historic achievements, with sporting memorabilia from his Grand Slam victories offered for auction in London on 23 June together with an online sale (23 June â 13 & 14 July), which chronicles his incredible career from the early 2000s right through to 2021. (Photo by Wiktor Szymanowicz/Anadolu Agency via Getty Images)