Czech Republic's Karolina Pliskova celebrates beating compatriot Lucie Safarova in their women's singles third round match on day six of the Australian Open tennis tournament in Melbourne on January 20, 2018. Pic/AFP

Karolina Pliskova outmuscled fellow Czech Lucie Safarova to make the Australian Open fourth round on Saturday in a testing two-set encounter. The tattooed sixth seed, looking to win her first Grand Slam, came through the tight match on Margaret Court Arena against her 29th seeded compatriot 7-6 (8/6), 7-5 in 1hr 37mins.