Järryd turned professional in 1980. He won his first tour doubles title in 1981 in Linz, Austria. One year later he captured his first top-level singles title, also at Linz. In 1983, Järryd won his first Grand Slam doubles title at the French Open, partnering his fellow Swede Hans Simonsson. Järryd had a strong year in 1984, winning two singles and five doubles titles. He also finished runner-up in the men's doubles at the US Open that year, partnering Stefan Edberg. 1985 saw Järryd's career-best Grand Slam singles performance, when he beat Claudio Panatta, Scott Davis, Vincent Van Patten, Danie Visser and Heinz Günthardt to reach the semi-finals at Wimbledon before being knocked-out in four sets by Boris Becker. Järryd reached his career-high singles ranking of world No. 5 in July 1985, and captured the world No. 1 doubles ranking that August. At the French Open and US Open, Järryd progressed to career best finishes in those two tournaments, finishing the fourth round and quarterfinal respectively. In 1986 he won the WCT Finals by beating Boris Becker in the final, while he and Edberg were the men's doubles runners-up at the French Open. Järryd won three of the four Grand Slam men's doubles titles in 1987, at the Australian Open, French Open and US Open. Järryd was also a member of Swedish team which won the Davis Cup that year. He won two singles rubbers in the final where Sweden beat India 5–0. In 1988, Järryd partnered John Fitzgerald to finish runner-up in the men's doubles at both the French Open and Wimbledon. Järryd also won a men's doubles bronze medal at the Olympic Games that year, partnering Edberg. Järryd was also a member of the Swedish team which won the World Team Cup in 1988. The following year, Järryd partnered Fitzgerald to win the men's doubles title at Wimbledon; thus completing a career set of all four Grand Slam men's doubles titles. 1991 again saw Järryd capture three of the four men's doubles titles, as he partnered Fitzgerald to win the French Open, Wimbledon and US Open, his last Grand Slam titles. Järryd reached his last Grand Slam doubles final at the 1993 Australian Open, partnering Fitzgerald again. Over the course of his career, Järryd won eight top-level singles titles and 59 tour doubles titles. His final singles title came in 1993 at Rotterdam. He won his final doubles title in 1995 at St. Petersburg. Järryd retired from the professional tour in 1996.
