INDIAN WELLS, Calif. (AP) — Russian teen star Mirra Andreeva advanced to the BNP Paribas Open final, beating defending champion Iga Swiatek 7-6 (1), 1-6, 6-3 in chilly conditions Friday night to become the tournament's youngest finalist since 2001.

Two-time Indian Wells champion Iga Swiatek avenged her shock Paris Olympics loss to Zheng Qinwen with a 6-3 6-3 win over the Chinese eighth seed to reach the semi-finals in the California desert, where she will face teenager Mirra Andreeva.

Defending champion Iga Swiatek beat Zheng Qinwen 6-3, 6-3 on Thursday, avenging her Olympics semi-final loss to the Paris Games gold medallist to reach the last four at Indian Wells.The world number two from Poland will get a chance to avenge another upset loss in a semi-final clash with Mirra Andreeva -- the 17-year-old Russian who stunned her in the quarter-finals at Dubai last month on the way to becoming the youngest-ever WTA 1000 champion.

Tennis star Iga Swiatek has been booed by spectators after smashing a ball at a ball boy in an ugly act of sportsmanship.

Iga Swiatek was beaten by Mirra Andreeva in the semi-finals of Indian Wells on Friday and she narrowly avoided hitting a ball kid in the third set.

Iga Swiatek went off the rails on Friday night during her loss to Mirra Andreeva in the semifinals of the BNP Paribas Open at Indian Wells, Calif. Swiatek lost 7-6 (1), 1-6, 6-3 to the 17-year-old Andreeva,