5u. Thunder 80 is Li Ning’s first “asymmetrical design” racket. Because of the 5U lightweight design, high balance point, nano-alloy materials, and new mid-tube technology, Watanabe Yuta likes to use this racket to play, so Watanabe uses the 5U Thunder 80 racket. Yudai Watanabe was born on June 13, 1997 in Suginami Ward, Tokyo, Japan. He is a Japanese badminton player.