The 18-year-old professional tennis player faced Agnieszka Radwanska on Saturday, July 29, 2013. Keys won the second match 6-4, but fell short in the first and third, 7-5 and 6-3, respectively.
Radwanska, from Poland, is ranked number 4 at Wimbledon.
The last time the two played each other was in 2012, where Radwanska won two matches, both 6-1.