Defending champion Iga Swiatek sets up an Indian Wells semi-final against teenager Mirra Andreeva, while top-ranked Aryna Sabalenka faces Madison Keys.

Defending champion Iga Swiatek made history in Indian Wells, Calif., on Thursday, becoming the first woman to advance to the semifinals of the BNP Paribas Open four years in a row.

Russian teenager Mirra Andreeva beat defending champion Iga Swiatek 7-6(1) 1-6 6-3 on Friday to reach the Indian Wells final for the first time as she sets her sights on back-to-back WTA 1000 titles.

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.