From 1991 to 1995, Rosner competed in the United States, playing for University of Alabama at Birmingham in NCAA Men's Tennis Championship.

He won one ATP World Tour title, at Bologna, Italy in 1998, with American Brandon Coupe.

[2] Rosner entered into the Men's doubles draw of 13 Grand Slams but only twice made it past the first round.

The first time was in the 1998 Wimbledon Championships, when he and partner David DiLucia reached the second round, by defeating Nicolás Lapentti and Javier Sánchez in four sets.

The pair made the round of 16, after two straight sets victories, but then fell to Ellis Ferreira and Rick Leach.