Madison Keys of the US plays a backhand return to Romania's Mihaela Buzarnescu during their women's singles fourth round match on day eight of The Roland Garros 2018 French Open tennis tournament in Paris on Sunday. Thomas SAMSON / AFP

American tennis player Madison Keys defeated 31st-seed Mihaela Buzarnescu of Romania 6-1, 6-4 to advance to the French Open quarterfinals for the first time in her career on Sunday. The 2017 US Open finalist earned her victory in 65 minutes and has not lost a single set in this year's French Open, reports Efe.