Australian world No.1 junior Nick Kyrgios has suffered a heavy defeat in the third round of the boys singles at Wimbledon dc gear motors.

Top seed Kyrgios was thumped 6-2 6-2 by Korean Hyeon Chung in a surprise result on Wednesday.

Australia's involvement in the juniors ended with Thanasi Kokkinakis, who lost to Kyrgios in the junior Australian Open final, also defeated on Wednesday espresso coffee cups.

He fell to Serbian fourth seed Laslo Djere 3-6 6-2 6-0.

Kyrgios, 18, impressed on his grand slam main draw debut at the French Open last month, beating Czech veteran Radek Stepanek in straight sets Korean skin care brand.

However he missed out on a wild card for the men's singles at Wimbledon.