On July 1, 15-year-old American tennis player Cori Gauff made the world stand up and take notice when she beat five-time Wimbledon champion Venus Williams 6-4 6-4 in the first round of Wimbledon’s main draw.

The teen is the youngest player to date to have qualified for the oldest tennis tournament in the world. But how much do you know about other tennis players whose young age made them stand out in the age category of this world-famous competition?