Argentina's Juan Martin del Potro stunned world No. 1 Rafael Nadal 6-2, 6-4 in the semifinals of Shanghai Rolex Masters on Saturday night.
Nadal, who regained the top ranking this week from Novak Djokovic, was overmatched in what is a very rare occurrence.
The 13-time Grand Slam champion's shots seemed to lack their usual speed and accuracy in the loss.
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.