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 ENagal 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.

Nagal is also competing in the doubles draw. The other Indians featuring in the doubles are Divij Sharan and N Sriram Balaji.uro 137,560 clay-court event.