James Spencer "Jim" Courier, Jr. (born August 17, 1970) is a former world no. 1 professional tennis player from the United States. During his career, he won four Grand Slam

Grand Slam (tennis)

The four Major tennis tournaments, also called the Slams, are the most important tennis events of the year in terms of world tour ranking points, tradition, prize-money awarded, strength and size of player field, and public attention. They are the Australian Open, the French Open, Wimbledon, and...

 singles titles, two at the French Open and two at the Australian Open. He holds the record for being the youngest man to have reached the finals of all four Grand Slam singles tournaments, at the age of 22 years and 11 months.