Mats Wilander
Say hello to the Swedish former World No. 1 who from 1982 to 1988, won seven Grand Slam singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one Grand Slam men’s doubles title (at Wimbledon). He and Rafael Nadal are actually the only men in tennis history to have won at least two Grand Slam singles titles on each of the three surfaces.
Mats Wilander
Jim Courier
Courier is the American former World No. 1 who won four Grand Slam singles titles, two at the French Open and two at the Australian Open. He actually holds the record for being the youngest man to reach the finals of all four Grand Slam singles tournaments, at just the age of 22 years and 11 months. He also won five Masters 1000 series titles, nice. Until Novak Djokovic in 2016, Courier was also the last man to win both the Australian and French Opens in the same calendar year.
Jim Courier
