The WTA stars in Singapore played around with Snapchat filters, which can now change not just your face but also your voice, making the whole experience even more ridiculous. No one is immune from mobile app fun, even at the most serious year-end tournament of the season.

Karolina Pliskova, Simona Halep, Madison Keys, Dominika Cibulkova, Angelique Kerber and Agnieszka Radwanska all tried their hand at saving normal statements with some notable enhancements.

In Monday's matches, Radwanska takes on Svetlana Kuznetsova while Pliskova will face Garbine Muguruza.