American 15-year-oldCoriGauffstole the show on the opening day of Wimbledon with a debut victory over five-time champion and her inspiration, Venus Williams. Meanwhile, defending champion Novak Djokovic eased into the second round but Alexander Zverev and Stefanos Tsitsipas - two of the leading lights in the so-called next generation of the men's game - suffered shock exits in SW19.