Karolina Pliskova d Lucie Safarova, 7-6 (8/6), 7-5 Karolina Pliskova defeated fellow Czech Lucie Safarova and enters fourth round of Australian Open women singles. The sixth seed, looking to win her first Grand Slam, came through the tight match against her 29th seeded compatriot 7-6 (8/6), 7-5 in 1hr 37mins. Pumped up @KaPliskova! She's just taken the first set 7-6(6) against countrywoman Lucie Safarova.#AusOpen pic.twitter.com/i7LTthFB3R — #AusOpen (@AustralianOpen) January 20, 2018 × "It was a tough match, it always is against Lucie," said Pliskova, who made the quarter-finals last year. "I'm happy I held my serve in the last game, It's a good sign because my serve is the most important key for me." Madison Keys d Ana Bogdan, 6-3, 6-4 Madison Keys continued her serene progress through the Australian Open draw with a 6-3, 6-4 win over unseeded Ana Bogdan on Saturday. "I'm really excited. I definitely feel I'm playing well," said Keys, who was one of only three Americans to make the round of 32. "Ana played great today and made me play my best tennis," Keys added. Lock @Madison_Keys in for 4R! ????#AusOpen pic.twitter.com/vPjotVhnwy — #AusOpen (@AustralianOpen) January 20, 2018 × The American will either face French eighth seed Caroline Garcia or Belarussian Alaksandra Sasnovich in the last 16. "Lindsay is amazing. We've had three years together and she has taught me how to handle big moments like this," said Keys.