Aus Open, Day 8: Rafa Nadal passes Fabio Fognini test with flying colors, local star Ash Barty sweeps into quarters

Matteo Berrettini withdrew from his Australian Open fourth-round match against Greek Stefanos Tsitsipas on Monday due to an abdominal strain. The walkover sent fifth seed Tsitsipas into the next round where he will meet Spain`s Rafa Nadal for a place in the last four of the year`s opening Grand Slam.(Twitter/australianopen) 

Andrey Rublev was gifted a place in the last eight after Norway`s Casper Ruud retired injured from the event.(Twitter/australianopen) 

Jessica Pegula continued her dream run at the Australian Open on Monday with a 6-4 3-6 6-3 win over fifth seed Elina Svitolina to set up an all-American quarter-final against Jennifer Brady, who beat Croatia`s Donna Vekic in straight sets. (Twitter/australianopen)

Rafa Nadal`s bid for a record 21st Grand Slam crown gathered pace with a 6-3 6-4 6-2 demolition of Fabio Fognini that pushed the Spaniard into his 13th quarter-final at Melbourne Park. (Twitter/australianopen) 

Czech Karolina Muchova recovered from a shaky start to defeat Belgian Elise Mertens 7-6(5) 7-5 on Monday and set up an Australian Open quarter-final against world number one Ash Barty. (Twitter/australianopen) 

Fourth seed Daniil Medvedev on Monday entered the men`s singles quarter-finals of the Australian Open for the first time after a commanding straight-sets win over Mackenzie McDonald. (Twitter/australianopen)  

Jennifer Brady defeated 28th seed Donna Vekic in their fourth-round match 6-1, 7-5 in an hour and 34 minutes to reach the Australian Open quarter-final for the first time. (Twitter/australianopen)  

Ash Barty made light of the challenge of unseeded American Shelby Rogers to reach the quarter-finals of the Australian Open for the third year in a row with a commanding 6-3 6-4 victory on Monday. (Twitter/australianopen)