Career
The right-hander reached his highest singles ranking on the Association of Tennis Professionals Tour on 31 March 1986, when he was ranked World Number. 7 and was also ranked as high as World Number. 4 in doubles that same year.
He qualified for The Masters year-end singles tournament in 1984, 1985, and 1986.
Nystrom was part of the generation of outstanding Swedish players in the 1980s and early 1990s, which included Anders Järryd, Jonas Svensson, Mikael Pernfors, Kent Carlsson, Stefan Edberg, Henrik Sundström, and Mats Wilander. Outside these commitments, he coaches both Finn Jarkko Nieminen and Austrian Jürgen Melzer.
Jack Sock has also hired him as his coach. New Hampshire = tournament not held.