The red dirt on the shoes is included as Roger Federer prepares to auction off some of the kit that has taken him to a record 20 Grand Slam men's singles titles.
Among the items going under the hammer on 23 June are clothing and racquets the Swiss great used in his 2009 French Open final win over Robin Soderling - his sole Roland Garros title - and the smart white cardigan he donned for his 2012 Wimbledon final win over Andy Murray.
The price tag estimates for the 20 lots being auctioned by Christie's range from £3,000 to £70,000, with the clothing and racquet he used in his victory over great rival Rafael Nadal in the 2007 Wimbledon final expected to fetch £30,000-£50,000.