Mats Arne Olof Wilander (born 22 August 1964) is a Swedish former world No. 1 tennis player. From 1982 to 1988, he won seven major singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one major men's doubles title (at Wimbledon). His breakthrough came suddenly and unexpectedly when he won the 1982 French Open at the age of 17.
In 1988, Wilander won three of the four singles majors and finished the year ranked as the world No. 1. Although he never won the singles title at Wimbledon, Wilander twice won the Australian Open when it was played on grass courts. This makes Wilander one of only six men (along with Jimmy Connors, Andre Agassi, Rafael Nadal, Roger Federer and Novak Djokovic) to have won major singles titles on grass courts, hard courts, and clay courts