These would be the only two occasions he won a Grand Slam mixed doubles match .
He only twice played with his younger sister , Annabel Ellwood , in the 1998 Australian Open and 1999 Wimbledon Championships .
These would be the only two occasions he won a Grand Slam mixed doubles match but he only twice played with his younger sister , Annabel Ellwood , in the 1998 Australian Open and 1999 Wimbledon Championships .