Angelique Kerber battles past Dominika Cibulkova in storming opening to WTA Finals in Singapore
German overcomes Slovakian in draining three-setter, while debutant Madison Keys is demolished by Simona Halep

Angelique Kerber was given a brutal reminder of the extra burden she carries as the new world number one when she was forced to battle through three sets before winning her opening match at the WTA Finals against Dominika Cibulkova on Sunday.
The German was pushed all the way by an inspired Cibulkova before the Slovakian finally buckled and Kerber prevailed 7-6 (7-5), 2-6, 6-3.
Although it was not her most polished performance, Kerber’s gritty victory underlined her fierce determination to cap her breakthrough season by adding the prestigious championship to her Australian Open and US Open titles.
“Of course the pressure is there,” Kerber said. “I feel the pressure of the different situation and I also have a lot more things to do in the last few days.
#SAPStatOfTheDay: On Day 1 of #WTAFinals, @AngeliqueKerber was well above her break point winning average of the season. pic.twitter.com/YuIrqD5k5N— WTA (@WTA) October 24, 2016
“It’s a challenge for me and I’m trying to play the best tennis in the last tournament in the last week of the year.