World Table Tennis Championships debutant Tomokazu Harimoto secured a shock 4-1 win over Rio bronze medalist Jun Mizutani on Thursday in the second round of men's singles.

The 13-year-old Harimoto, whose parents are from China, won the boy's singles at the world junior championships in December for players 18 and under and his star is continuing to rise, defeating world No. 6 Mizutani 11-7, 11-6, 14-12, 7-11, 11-8.

"It's been the happiest moment of my table tennis career," said an excited Harimoto after beating his idol. "It was good I managed to get on the front foot with both my serves and returns. My emotion came out in my play."