Wimbledon winner Petra Kvitova opened play at the WTA Championships with a convincing 6-2 6-4 victory over Russia's Vera Zvonareva in Red Group on Tuesday.
The Czech left-hander, making her debut at the season-ender after a memorable year which has seen her rise to No.3 in the rankings this week, was romping away with it in the Sinan Erdem Dome until a second-set lapse slowed her progress.
From 1-4 in the second set Zvonareva rallied to break the Kvitova serve twice and level at 4-4 only to surrender her own serve again immediately.
Kvitova, 21, made no mistake as she served for the match, angling away a volley on a her first match point to open her account in the round-robin format.
World number one Caroline Wozniacki was next on court against Poland's Agnieszka Radwanska, also in Red Group, while Blue Group play commences with Maria Sharapova, the only player who can topple Wozniacki from top spot, taking on U.S. Open champion Samantha Stosur.
Istanbul is hosting the event, worth a staggering $4.9 million in prize money, for the first time after taking over from Doha for three years.