It promises to be a terrific Thursday at Wimbledon as Swiss great Roger Federer, Spaniard Rafael Nadal, seven-time Wimbledon champion Serena Williams, defending champion Angelique Kerber, world no 1 in women's singles Ashleigh Barty, world no 4 Kiki Bertens and others will be in action on Day 4 of Wimbledon 2019.