Novak Djokovic
Serbia
Serbia's Novak Djokovic has won a record 24 men's Grand Slam singles titles: 10 Australian Opens, 7 Wimbledons, 3 US Opens, and 3 French Opens. He is the only player to have won multiple titles at all four Grand Slam tournaments. Alongside Rafael Nadal (22) and Roger Federer (20), he formed the celebrated "Big Three" who dominated men's tennis from the 2010s onward. He is also one of the few players to complete the Career Golden Slam (all four majors plus Olympic gold).