LONDON, ENGLAND - JUNE 27: A member of staff is pictured holding several tennis balls during the 2017 Wimbledon qualifying session on June 27, 2017 in London, England. (Photo by Alex Pantling/Getty Images)
LONDON, ENGLAND - JUNE 27: A member of staff is pictured holding several tennis balls during the 2017 Wimbledon qualifying session on June 27, 2017 in London, England. (Photo by Alex Pantling/Getty Images)