WTA Finals: Aryna Sabalenka battles past Karolina Muchova in her opening match at Indian Wells

Aryna Sabalenka won her Group 2 opener against Karolina Muchova 7-6 (7-2) 7-5; the four-time Grand Slam champion is looking to win the WTA Finals for the first time; watch the WTA Finals from Indian Wells this week, live on Sky Sports Tennis