India's top singles player Sumit Nagal advanced to the singles quarterfinals of the Prague Open with a come-from-behind win over lower-ranked Kiri Lehecka. Sixth seed and world number 127 had to battle hard to prevail 5-7 7-6(4) 6-3 in two hours and 21-minute second round contest of the Euro 137,560 clay court event.

Nagal is expected to meet three-time Grand Slam winner Stan Wawrinka in the next round. The Swiss is up against Germany's Oscar Otte in his second round contest.