Yonex, the racquet sponsor of Nick Kyrgios, has introduced a controversial contract clause that entitles the manufacturer to strip a chunk out of their clients' retainer for every racquet smashed.

In a revolutionary move that has been met with some resistance from its clients, Yonex remains hellbent on maintaining a clean image and has moved to stop its players from smashing racquets on courts around the world.

Yonex's highest profile clients include women's world No.1 Angelique Kerber, three-time grand slam champion Stan Wawrinka as well as Australia's Daria Gavrilova and Kyrgios.

Over the first three days of the Australian Open, 11 players were fined for racquet and equipment violations, including the 21-year-old Kyrgios in his five-set loss to Andreas Seppi on Wednesday night.