Former world No.1 Angelique Kerber continued her strong start to the season by advancing to the Sydney International semifinals with a 6-3, 6-1 win over Dominika Cibulkova on Thursday.
Kerber, who began previous year as No 1 before finishing at No 22, continued her 2018 resurgence with a thumping 6-3, 6-1 win over Slovakia Dominika Cibulkova.
The German made her breakthrough in 2016, with wins at the Australian Open and Flushing Meadows, but struggled past year, falling to 22nd in the world.
During the trophy presentation, Kerber said: "I am playing incredible tennis again and feeling just great". I played some of my best tennis this week and it wasn't enough.
Kerber, who knocked out Venus Williams in her opening match in Sydney, said she was not yet back to her best form of 2016 when she won the Australian and US Opens. But I'm feeling good - I'm healthy.
The other semi-final will be an all-Australian affair between Ashleigh Barty and Daria Gavrilova.
Elsewhere, Elise Mertens defended her Hobart International title after a 6-1 4-6 6-3 win over Mihaela Buzarnescu.
She had already beaten Olivia Rogowska in the first round and former U.S. Open champion Sam Stosur in the second and advanced to the semi-finals after Wimbledon champion Garbine Muguruza withdrew with a hip injury.
Medvedev will next play Australian 18-year-old Alex de Minaur, who defeated Benoit Paire of France 4-6, 6-1, 6-1.
In men's semifinals, Russian qualifier Daniil Medvedev booked a spot in the final by upsetting fourth-seeded Fabio Fognini of Italy 2-6, 6-4, 6-1.