Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) -- Sixth seed Juan Martin del Potro suffered a shock third-round defeat at the Australian Open on Saturday losing in five sets to unseeded Frenchman Jeremy Chardy. The former U.S. Open champion and quarter-finalist in Melbourne 12 months ago had dropped just 13 games in his opening two matches, but Chardy soon had the big Argentine on the back foot taking the opening two sets with ease. The third was much closer, finally going del Potro's way in the tiebreak and when the Argentine took the fourth set, Chardy's chances of pulling off an upset looked to have gone.Former U.S. Open champion suffers shock third-round exit from Australian OpenUnseeded Jeremy Chardy from France beats sixth-seed Argentine in five setsRoger Federer, Andy Murray safely through to fourth round with straight-set winsSerena Williams and Sloane Stephens into fourth round in women's draw 
 Question:In the women's draw, _ remains on course for a sixth singles title in Melbourne.

Serena Williams