McGrath played in 1988 for the first time on the WTA Tour. In her career she won there three individual titles: in 1994 at the hard court tournament in Oklahoma City and the grass tournament of Eastbourne, in 1996, then the tournament in Birmingham, which was also played on grass. In 1995 she won the U.S. Open in mixed doubles at the side of Matt Lucena.
Far greater success had McGrath in doubles. Here she won a total of 25 WTA tournaments.