Shimada was born in the United States and began his professional career in 1993. Early on, he specialized in the double and won on the second-rate Challenger Tour in his career total of seven doubles titles. Also on the ATP Tour reach him three tournament victories, and three other Finaleinzüge. Its highest listing on the double World Ranking position was 40 in 2004. 's Doubles competition his best result was always the second round, he could reach at all Grand Slams at a Grand Slam tournament.
Shimada played between 1994 and 2003 for a total of 16 matches for the Japanese Davis Cup team. He was always in double used, with its partners varied. Seven wins, against nine defeats.
At the Olympic Summer Games 2000 in Sydney Shimada joined together with Satoshi Iwabuchi in the doubles competition. The two documents already in the opening round of the Slovak Dominik Hrbatý and Karol Kučera 4:6, 3:6.