World No.36 Nishikori upset world No.18 Tomas Berdych of the Czech Republic 4-6, 6-2, 6-1 in the tennis match that lasted one hour and 46 minutes here on Monday night, reports EFE news agency.
This was Nishikori's third win against Berdych out of four career encounters.
World No.33 Rublev triumphed over world No. 44 Robin Haase of the Netherlands 7-6 (7), 2-6, 7-5 in two hours and 30 minutes.
Nishikori, aged 28, is set to play against Russia's Daniil Medvedev, world No.49, in the next round.
Meanwhile, the 20-year-old Rublev moves on to face world No.7 Dominic Thiem of Austria.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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