Tennis: Teen wonder Marta Kostyuk bows out with free lesson from fellow Ukrainian Elina Svitolina

Marta Kostyuk of Ukraine in action during round three on day five of the Australian Open tennis tournament, in Melbourne on Jan 19, 2018.
Marta Kostyuk of Ukraine in action during round three on day five of the Australian Open tennis tournament, in Melbourne on Jan 19, 2018. PHOTO: EPA-EFE