Iwabuchi was particularly successful on the Challenger Tour during his career . He won a total of eight titles, including one in singles and seven more doubles. On the World Tour , he celebrated his greatest success with his win in the doubles competition at the home tournament in Tokyo . Together with Takao Suzuki , he defeated Simon Aspelin and Todd Perry in straight sets in the final . In Grand Slam tournaments , he failed in his only attempts to qualify in 2007 at the Australian Open and Wimbledon . In both tournaments he was in the first round in doubles: 2000 in Wimbledon and 2006 in Melbourne.
From 1995 to 2009 Iwabuchi played for the Japanese Davis Cup team . In 20 encounters he played 22 games. He won two of his three games in singles, eleven wins against eight defeats in doubles. With nine joint double victories, he and Takao Suzuki are the most successful in Japanese Davis Cup history.