Petra Kvitova and Caroline Wozniacki Book Their Spots at 2018 BNP Paribas WTA Finals Singapore presented by SC Global • Kvitova to make sixth appearance at WTA Finals, as a former champion in 2011, following a tour-leading five titles this season • Australian Open champion Wozniacki returns to Singapore as the defending champion and a former finalist in 2010 • The Czech … [Read more...] about Petra Kvitova and Caroline Wozniacki Book Spots for 2018 BNP Paribas WTA Finals Singapore