He won the national high school championship with his teammates including Katsumi Oenoki and Takumi Horiike.

After graduating from the university in 1988, he joined Japan Soccer League side Nissan Motors (current Yokohama F. Marinos).

He scored for the first time for his country on June 11, 1989 in a 1990 World Cup qualification against Indonesia at Nishigaoka Soccer Stadium in Tokyo.

In the crucial last match, Hasegawa was substituted in the 59th minute by Masahiro Fukuda and watched from the bench a late Iraqi equaliser dashed Japan's hope to qualify for the finals in the US, the match that the Japanese fans now refer to as the Agony of Doha.

[2] In 2008 Hasegawa led S-Pulse to the final of the J.League Cup and a fifth-placed finish in the league, a placing which included them being the strongest performing team in the second half of the season.

In 2021, after a three year spell in which the club finished 6th, 2nd, 6th, and 9th in four respective seasons, Hasegawa resigned after an 8 - 0 loss to 2nd place Yokohama F.

[5] [6] [1] In popular manga and anime series Chibi Maruko-chan, a boy called Kenta kun occasionally makes an appearance.