India's Saina Nehwal has cruised into the quarter-finals of the Women's Singles in the World Badminton Championships. In the third round of the event in Paris on Thursday, Saina defeated Russia's Ella Diehl in straight games, 21-14, 21-18. The second seeded Indian took just 40 minutes to beat the 13th seeded Russian to sail into the last-eight stage. Saina will next take on the winner of the match between sixth seed Chinese Shixian Wang and 11th seed Jie Yao of the Netherlands. The Indian mixed doubles duo of V Diju and Jwala Gutta have also entered the quarterfinals. They overcame early sluggishness to beat Singapore's Chayut Triyachart and Lei Yao in three games 14-21, 21-18, 21-14. The Indian duo will now face 12th seeds South Korea's Sung Hyun Ko and Jung Eun Ha for a place in the semifinals. The Korean pair progressed by shocking fifth seeds Joachim Fischer Nielsen and Christinna Pedersen of Denmark.