Izawa was born in Kanagawa, attended Nihon Taiiku University, and turned professional in 1989.

In the first of those years he set a record of ¥217,934,583 in earnings which survived though the 2004 season, and his dominant form in Japan lifted him into the top twenty in the Official World Golf Ranking.

In early 2001, he finished joint runner-up at the PGA Tour's Nissan Open.

*Note: The 2000 JGTO TPC iiyama Cup was shortened to 54 holes due to weather.

Japan Golf Tour playoff record (2–1) PGA Tour playoff record (0–1) CUT = missed the half-way cut WD = withdrew "T" = tied 1Cancelled due to 9/11 QF, R16, R32, R64 = Round in which player lost in match play "T" = Tied NT = No tournament