Jan Gunnarsson (born 30 May 1962) is a former tennis player from Sweden, who won one singles title in Vienna in 1985 (beating Libor Pimek in the final) and nine doubles titles on the world tour during his professional career. In 1989 he reached the semi-finals of Australian Open where he lost in straight sets to Miloslav Mečíř. Along with Michael Mortensen he won the longest tie-break in tennis history at Wimbledon in 1985. The Swedish/Danish duo defeated John Frawley and Víctor Pecci in the first round. The right-hander reached his career-high ATP singles ranking of world No.
https://en.wikipedia.org/wiki/Jan_Gunnarsson