Prague: Sumit Nagal advanced to the singles quarterfinals of the Prague Open with a hard-fought victory over lower-ranked Kiri Lehecka.

India’s top singles player Nagal prevailed 5-7, 7-6(4), 6-3 in two hours and 21 minutes in the second round contest of the 137,560 euro clay-court event.

It is likely that he will meet Stan Wawrinka in the next round. The Swiss is up against Germany’s Oscar Otte in his second-round clash.

Other Indians in the fray are Divij Sharan and N. Sriram Balaji, who will be competing in the doubles events with separate partners.