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