Polish tennis star Iga Świątek was booed during her semifinal match against 17-year-old Mirra Andreeva at the BNP Paribas Open at Indian Wells for smashing a ball back at a ball boy.

In doing so, Andreeva became the youngest player to advance to the Indian Wells final since Kim Clijsters in 2001. She also became the fifth player to reach this stage before turning 18 years old since the tournament’s inception in 1989; the other four players to do so are Clijsters, Monica Seles, Martina Hingis and Serena Williams.

The Russian tennis star will be the youngest player since Kim Clijsters in 2001 to play for a BNP Paribas Open title.