Maria Sharapova made light of her long injury layoff by advancing to the last four of the WTA Finals with an unbeaten record in round robin play after the Russian breezed past Flavia Pennetta 7-5 6-1 on Thursday.
Simona Halep's roller-coaster season came to a welcome halt on Thursday when a crushing first set tie-breaker against Agnieszka Radwanska at the WTA Finals.
Russian Agnieszka Radwanska battled her way past Romanian Simona Halep in the WTA finals as she set herself up for a semi-final match against Pennetta.
Spain's Garbine Muguruza moved to the brink of the WTA Finals last four with a 6-4 6-4 win over Angelique Kerber on Wednesday after Petra Kvitova opened her account with a 7-5 7-5 victory over fellow Czech Lucie Safarova.
Roger Federer bounced back to form with a quick-fire win over Mikhail Kukushkin as he began his bid for a seventh title at his hometown tournament in Basel.
When it come to tennis there is no greater prize than winning a grand slam singles title. Hree are some players who achieved this at an unbelievable age.