Mirra Andreeva has taken the WTA Finals by storm. Now she must embrace the pressure

INDIAN WELLS, Calif. — Mirra Andreeva can’t seem to help it. Something about the California desert brings out the diva in her. The 19-year-old from Russia has had some of the highest and lowest moments of her career at Indian Wells, Calif. The spectrum of experiences now includes Saturday’s 6-3, 6-4 win over Jessica Pegula, which took her to the…