Roger Federer to auction off Grand Slam memorabilia
Fancy owning a pair of Roger Federer's trainers?
The Swiss tennis star is auctioning off some personal items in June
to raise money for the Roger Federer Foundation
Fans will have the chance to buy signed rackets and clothing
Each lot reflects one of Federer's 20 Grand Slam wins
Prices will range from $4,000 to $97,000
A second online auction in July will sell cheaper items
such as Federer's old wristbands
Christie's values the whole collection at over $1.4 million
Federer's charity supports educational projects
in southern Africa and Switzerland