Denmark's top seeded Caroline Wozniacki moved into the quarter-finals of the Australian Open with a 6-3, 6-4 win over unseeded Latvian Anastasija Sevastova.
It is the first time the 20-year-old world number one has progressed past the fourth round in Melbourne and keeps alive her hopes of winning a maiden Grand Slam title.
Wozniacki failed to dominate her unheralded opponent and struggled to hold serve throughout their Sunday's 80-minute encounter.
However she prayed on Sevastova's mistakes while hardly making any of her own, committing just 14 unforced errors to the Latvian's 36 over the two sets.
"Anastasija's a tough opponent – she mixes her game up so well," Wozniacki said.
"She can play hard and then slows the ball down and it makes it hard to play against her."
Wozniacki has had to answer questions all week about the legitimacy of her world number one ranking after she reached the pinnacle without having won a Grand Slam.
But she has now won all four matches in Melbourne without dropping a set.
She next takes on either dual Grand Slam winner Svetlana Kuznetsova or reigning French Open champion Francesca Schiavone in the quarter-finals.
