The 1983 Transamerica Open, also known as the Pacific Coast Championships, was a men's tennis tournament played on indoor carpet courts at the Cow Palace in San Francisco, California in the United States. The event was part of the 1983 Volvo Grand Prix circuit. It was the 95th edition of the tournament and was held from September 19 through September 25, 1983. The singles event had a field of 32 players. Second-seeded Ivan Lendl won the singles title.[1]
Ivan Lendl defeated 
John McEnroe 3–6, 7–6(7–4), 6–4
Peter Fleming / John McEnroe defeated Ivan Lendl / Vincent Van Patten 6–1, 6–2