Career
Ishiguro had wins over Ingo Buding and Keith Carpenter in the 1963 Wimbledon Championships, to make the third round, where he lost to Jaidip Mukerjea in straight sets. He was a quarter-finalist at the Queen"s Club Championships in 1964. He then beat Jean-Noel Grinda to progress to the third round, but his run would end there, losing to second seed Fred Stolle.
Ishiguro was a gold medalist at the 1966 Asian Games, beating countryman Ichizo Konishi in the final.
He took part in 17 Davis Cup ties for Japan, from 1958 to 1966.