Former champion Rafael Nadal and fourth seed Daniil Medvedev both cruised into the Australian Open quarter-finals.
Spaniard Nadal, the 2009 winner and number two seed, gained a routine 6-3 6-4 6-2 win over Italy's 16th seed Fabio Fognini at Melbourne Park.
Medvedev beat American world number 192 Mackenzie McDonald 6-4 6-2 6-3 to claim his 18th consecutive victory.
It means there are three Russians in the quarter-finals of a Grand Slam for the first time in the Open era.
"I want more all the time, but step by step, so this is amazing," said Medvedev, who only needed one hour and 29 minutes to defeat McDonald on Margaret Court Arena.
Medvedev will face compatriot Andrey Rublev in the last eight. Seventh seed Rublev was leading 6-2 7-6 (7-3) when Norwegian opponent Casper Ruud retired with an injury.
Aslan Karatasev, who had to win three matches in the qualifying event in Doha, won on Sunday as his dream Grand Slam debut continued.
No Russian male has won a Grand Slam since Marat Safin in Melbourne in 2005.
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