( CNN ) -- Two former world No . 1s . Two tennis stars who have been unlucky in love with golfing partners . Two women who are getting their careers back on track . Caroline Wozniacki will take on Ana Ivanovic in Sunday 's final of the Pan Pacific Open in Tokyo in a battle of two players who have promised so much , but fallen frustratingly short . Wozniacki 's fortunes have taken a remarkable turn for the better since Rory McIlroy called off their wedding -- with a phone call -- in May . While the golfer regained his best form immediately , winning two major titles in a month , Wozniacki 's resurgence has been more gradual -- culminating in defeat to Serena Williams in this month 's U.S. Open final . The Dane , who won the Tokyo title in 2010 , is seeking the 23rd WTA Tour crown of her career , and second this year following July 's Istanbul success . She had to show her renowned fighting qualities on Saturday before battling to a 6-4 2-6 6-2 win over 20-year-old Spaniard Garbine Muguruza , who this season has reached the first two finals of her career , winning one of them . `` She was playing really , really well and very aggressively , but I just kept fighting and staying in there , and I think at the end I had just a little bit more energy than she did , '' Wozniacki said after her 22nd win in 26 matches since the hard-court swing began . The 24-year-old needs to improve on her 2-4 career record against Ivanovic , who holds the last of eight qualifying places in the race to feature at the season-ending championships in Singapore -- Wozniacki is ninth , with five slots yet to be decided . The Serbian , who had an on-off relationship with Australian golfer Adam Scott earlier this decade , has won three of her five finals in 2014 after rebuilding her game and ranking . Unlike Wozniacki , she has a grand slam title to her name -- the 2008 French Open -- but has not done so well in this season 's majors since reaching the Australian Open quarterfinals in January . Ivanovic lost in the 2007 Tokyo final before it became a premier-level event on the tour , and the 26-year-old has another chance for Japanese success after knocking out top seed Angelique Kerber in Saturday 's semifinals . She came back from 5-3 down in the opening set , winning 10 of the next 13 games to triumph 7-5 6-3 against the German -- who lost to Petra Kvitova in last year 's final . `` In the beginning it really took me some time to adjust to her game . It was n't like my previous matches , '' Ivanovic said after her 51st win this season , equaling her career best achieved seven years ago . `` But once I adjusted and got more aggressive it started to go my way , and I 'm really happy with the win today because she 's always such a tough and challenging opponent . '' Meanwhile , Romania 's Monica Niculescu won the second WTA Tour title of her career Saturday , beating France 's Alize Cornet 6-4 6-0 in the final of the Guangzhou International Women 's Open . American Varvara Lepchenko will play Czech Karolina Pliskova in Sunday 's Korea Open final in Seoul .
Garbine Muguruza faces Ana Ivanovic in the final of the Tokyo Open . Wozniacki battles past rising star Caroline Wozniacki in three sets . Ivanovic overcomes top seed Angelique Kerber in second semifinal . China 's Caroline Wozniacki wins her second WTA Tour title in Romania .