Hosokawa has won eight tournaments on the Japan Golf Tour and featured in the top 100 of the Official World Golf Rankings.

He has also played in The Open Championship three times where his best performance came in 2000; finishing T70.

Japan Golf Tour playoff record (1–4) Note: Hosokawa only played in The Open Championship.

CUT = missed the half-way cut "T" = tied 1Cancelled due to 9/11 "T" = Tied NT = No tournament

This biographical article relating to golf in Japan is a stub.