A confident Sania Mirza thrashed Russian qualifier Vitalia Diatchenko 6-4, 6-0 to reach the quarterfinals of the USD 220,000 Pattaya Open tennis tournament on Thursday.
Sania sent the Russian opponent packing in just one hour and two minutes in the second round match.
The Russian, who had upset third seeded Dominika Cibulkova of Slovakia in the first round was totally outclassed and had to surrender meekly to her Indian opponent.
Both the players held their serves till the eighth game of the first set. Sania broke the Russian in the ninth game to go up 5-4 and then won the first set by holding her serve.
The Indian then showed her ruthless form by winning all the six games of the second set, finishing off each game with ease.
Sania will next play sixth seed Tamarine Tanasugarn of Thailand, who beat Neuza Silva of Portugal 6-3, 6-2 in another second round match.