Do you want the chance to win a tennis ball signed by Sara?
Send the answer to the question below to our Twitter account @SaraErraniSite or email it to email@example.com and maybe you are the lucky one!
You can send in your answers until 6PM CET on november 25. We will announce the winner on november 26.
Here is the question:
Who was the highest ranked player Sara beat in singles in 2014, and what was her ranking?