Maezono was born in Satsumasendai on October 29, 1973. After graduating from Kagoshima Jitsugyo High School, he joined J1 League club Yokohama Flügels in 1992. He debuted in June 1993 and he became a regular player after his debut. The club won the 1993 Emperor's Cup, their first major title. In Asia, the club also won the 1994–95 Asian Cup Winners' Cup, their first Asian title. In 1997, he moved to Verdy Kawasaki (later "Tokyo Verdy"). In October 1998, he moved to Brazil and played for Santos (1998) and Goiás (1999). In 2000, he returned to Japan and joined J2 League club Shonan Bellmare. In 2001, he returned to Tokyo Verdy. In 2003, he moved to South Korea and played for Anyang LG Cheetahs (2003) and Incheon United (2004). He announced his retirement in May 2005.