Born in Herzliya, Weidenfeld had a promising junior career, which included a win over Jim Courier.

[1] As a junior he competed in several grand slam events, twice making the round of 16, at the 1986 Wimbledon Championships and 1988 French Open.

[2] Weidenfeld began competing professionally in the late 1980s and represented Israel once in a Davis Cup tie, a 1990 World Group relegation play-off at home against China.

In the final reverse singles, Weidenfeld defeated Di Lin in straight sets, to complete a 5-0 whitewash.

[3] His ATP Tour main draw appearances came in four editions of the Tel Aviv Open and 1997 tournaments in Indianapolis and Tashkent.