Wild card entrant Sanam Singh led the Indian challenge by knocking out Australian top seed James Duckwoth in the 100,000 US Dollar ATP Challenger tennis tournament in New Delhi today. With this win, Sanam Singh has entered the singles quarterfinals of the tournament. Yuki Bhambri and Somdev Devvarman also entered the last eight. Sanam will now clash with compatriot and top singles player Somdev Devvarman, in the quarterfinals.