Kento Momota faced off against Shi Yuqi in the first match of the semi-final tie of the Thomas Cup between Japan and China.

After battling out for 40 mins on the court, Momota earned himself a host of match points with the score at 22-20, 20-5.

Shi Yuqi walked up to the umpire at this point and chose to retire, refusing to give a proper win to Momota. Such an action in badminton is extremely unusual at best, and very unsportsmanlike at worst.