[5] In total he won ten World Championship medals[6] His mixed doubles partners were Noriko Yamanaka and Yasuko Konno respectively and his men's doubles partners were Mitsuru Kono and Tokio Tasaka.

Hasegawa was a famous exponent of heavy topspin forehand attack, combined with lob defence.

He used a modified shakehands grip with the index finger pointing down the center of the blade.

This made his backhand a little awkward for fast attack, so even though a shakehander his tactics were similar to the Japanese penholders with wonderful footwork.

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