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Leander Paes in partnership with Miguel Angel Reyes-Varela of Mexico pipped top seeds Dominic Inglot and Franko Skugor in the doubles pre-quarterfinals of the $1,241,850 ATP Tour event in Russia.
The Indo-Mexican pair will play Matteo Berrettini and Fabio Fognini of Italy in the quarterfinals.
Meanwhile, Davis Cupper Ramkumar Ramanathan beat Maximilian Neuchrist of Austria 6-4, 6-2 in the first round of the $150,000 Challenger.
However the other Davis Cupper, Prajnesh Gunneswaran was beaten in three sets in the first round by Jurij Rodionov of Austria.