James “Jim” Spencer Courier Jr. is an American former world No. 1 professional tennis player. For 15 years, he has been the main commentator on the Australian Open for the host broadcaster the Seven Network and now the Nine Network. During his career, he won four Grand Slam 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. He also won five Masters 1000 series titles. Until Novak Djokovic in 2016, Courier was the last man to win both the Australian and French Open titles in the same calendar year.