Sasi Kumar Mukund got the better of Chinese wonder-kid Yibing Wu but in-form Prajnesh Gunneswaran suffered a shock first round defeat at the ATP Challenger tournament in Shenzen, China.

The 21-year-old Sasi, who qualified into the main draw and has made good progress on the Pro circuit, defeated Wu 7-6 (4) 6-2 in one hour and 20 minutes to move to the second round of the USD 75,000 hard court event on Monday. Wu had won the junior US Open last year and also became junior world number one after his Grand Slam win. Sasi will next face Canadian eighth seed Filip Peliwo. Fourth seed Prajnesh, who played intense tennis in the past two weeks, lost 3-6 4-6 to Alejandro Davidovick Fokina from Spain.