Melbourne, Feb 15 : World number two Rafael Nadal on Monday entered the Australian Open quarter-finals for the 13th time after getting past Fabio Fognini in their fourth round contest. Nadal, the 2009 champion, registered a 6-3, 6-4, 6-2 win over the Italian No. 16 seed in two hours and 16 minutes at the Rod Laver Arena. "When you go on court against Fabio, you worry," said Nadal after the match as per the ATP Tour website. "There can always be problems. I was just lucky that when he broke me (in the second set) I responded immediately and held the score. Today was very humid and quicker during the day, which I like, but I have to adapt to every condition," he added. The 34-year-old is looking to become the first man in the Open Era to clinch each of the four major championships on two or more occasions. He will next face fifth-seeded Greek Stefanos Tsitsipas, who received a walkover after No. 9 seed Matteo Berrettini of Italy withdrew due to an abdominal strain. Earlier in the day, fourth seed Daniil Medvedev also booked his place in the quarter-finals after a commanding straight-sets win over Mackenzie McDonald. Medvedev beat the 25-year-old American 6-4, 6-2, 6-3 in his fourth-round match that lasted an hour and 29 minutes at the Margaret Court Arena. He will face Andrey Rublev in what can be a blockbuster quarter-final clash on Wednesday. /IANS