Qualification for the semi-finals of the singles and doubles has ensured a heavy workload for Garbine Muguruza at the WTA Finals.
Garbine Muguruza is aware she will be tested physically after qualifying for the semi-finals of the singles and doubles competitions at the WTA Finals.
The Spaniard on Friday made it three wins out of three in the singles, eventually getting the better of Petra Kvitova in a match that featured 15 breaks of serve.
Muguruza is the first player since 2009 to reach the last four of the singles and doubles - in which she is partnering Carla Suarez Navarro - at the WTA Finals, with her success making for a busy week in Singapore.
"Well, for sure I'm tired today," said the 22-year-old after beating Kvitova.
"It's going to a challenge for me to see how much my body can handle.
"It's great to be in my position, I think, to be playing singles and doubles semi-finals, but it's going to be hard.
"I have to recover well and do everything possible to be ready for both matches."
Muguruza headed into her final singles match against Kvitova needing just one set to secure her place in the last four.
However, after being taken to a decider, the second seed twice came from a break down to maintain her 100 per cent record in the White Group.
"I went to the court thinking that I want to win the match, not only a set or just to qualify," Muguruza explained. "[I told myself] if you go on the court you have to go and win, not to be half and half.
"So that's what I did. I had my good and bad moments, but I'm just happy that I've been through."
Despite Muguruza's victory, Kvitova also qualified for the semi-finals later on Friday courtesy of fellow Czech Lucie Safarova beating Angelique Kerber in straight sets.