World number eight Kiki Bertens is now in double figures for WTA titles after she once again proved to be a cut above in St Petersburg.
Defending St Petersburg Ladies' Trophy champion Kiki Bertens overcame Ekaterina Alexandrova to set up a final against Elena Rybakina.
Johanna Konta was the biggest name to lose in St Petersburg, where Belinda Bencic booked her place in the last eight.
Elena Rybakina secured her second WTA Tour title by beating Zhang Shuai in the Hobart International final.
The Adelaide International final will see the world's top player face one of the WTA Tour's brightest stars.
A viral illness forced Garbine Muguruza to pull out of the Hobart international but she hopes to be fit for the Australian Open.
Angelique Kerber retired from the Adelaide International due to a back injury, while Marketa Vondrousova thrashed Arina Rodionova.
Anastasia Pavlyuchenkova put up an admirable fight against Ash Barty at the Adelaide International, but the world number one did enough.
Serena Williams ended her drought by defeating fellow American Jessica Pegula 6-3 6-4 in the women's final in New Zealand.
Serena Williams needed just 44 minutes to brush past Amanda Anisimova in the Auckland Open semi-finals.