Ozaki was born in Tokyo Metropolis on March 7, 1960. After graduating from Nihon University High School, he joined Japan Soccer League club Mitsubishi Motors in 1978. In 1978, the club won all three major title in Japan; Japan Soccer League, JSL Cup and Emperor's Cup. The club also won 1980 Emperor's Cup, 1981 JSL Cup and 1982 Japan Soccer League. He was also selected "Japanese Footballer of the Year awards" in 1982.