Most of Behr's success was on the
Challenger and Futures level, but he often participated in qualifying tournaments of major
ATP events. In 1992, he reached the finals of the US Open boys' singles, losing 7–5, 6–2 to
Brian Dunn of the United States. He and
Yshai Oliel, who reached the boys' singles final at the 2017 Australian Open, are the only two Israelis to have reached the finals in a boys' Grand Slam event. In October 1995, he upset world No. 97
Jeff Tarango in Tel Aviv, 6–4, 3–6, 7–5. In October 1998 he and
Eyal Ran won in
Uzbekistan. In December 1998 and February and April 1999, he and Ran won in
Mumbai,
Calcutta, and New Delhi, India. In October, he and Ran won in Tel Aviv, and he and Andrei Stoliarov won in Uzbekistan. In July 2000, he and partner Eyal Erlich won in
Istanbul, Turkey. In October 2000 in Germany, he defeated world No. 66
Martin Damm, 3–6, 6–1, 6–4. That same month he and partner
Aisam-ul-Haq Qureshi of Pakistan won in Nevers, France. In July 2001 in Toronto, he beat world No. 53
David Prinosil, 6–1, 7–6(2). In September in Shanghai, he beat world No. 80
Andrew Ilie 7–5, 6–4. In January 2001, he and
Andy Ram won in
Aventura, Florida. In March, he and
Noam Okun won in
Kyoto, Japan, and in
Hamilton, New Zealand. In April 2002, he and Ota Fukárek won the doubles in
Leon, Mexico. In July 2002, he and partner
Michael Joyce won a tournament in
Quebec, Canada. He was eliminated in qualifiers at the 2002
US Open. Behr is now the coach of Ram and Erhlich.
Davis Cup Behr was 6–7 in
Davis Cup play for Israel from 1995 to 2001. ==Junior Grand Slam finals==