![Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 26, 2017 USA's Venus Williams celebrates winning her group stage match against Spain's Garbine Muguruza REUTERS/Jeremy Lee TPX IMAGES OF THE DAY](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/GR74KKLVNQA42325OOMSCC4I64.jpg?smart=true&auth=e042f6e7e6edf4eb031777799b0eed2f2d5c7cf3a52ea63d986f5bdf1abe3fba&width=400&height=225)
Venus Williams celebrates after beating Garbine Muguruza at the WTA Finals. Jeremy Lee / Reuters
Venus Williams celebrates after beating Garbine Muguruza at the WTA Finals. Jeremy Lee / Reuters
WTA Finals: Williams books semi-final place to stay in No 1 hunt, Pliskova struggles for motivation in defeat to Ostapenko
The American last occupied top spot in the rankings 15 years ago, but could make a return by winning the WTA Finals title.