Talent and graft account for a great deal, but sport at the top level is as much about peaking at the right time as anything else. For British tennis players, this means raising their game for Wimbledon, something Sonay Kartal knows all about.
Sidcup-born Kartal was only 22 last summer when she became the first British female qualifier to reach the third round at Wimbledon since 1997.
