Gimeno's best year was in 1972, when he was a finalist in Brussels and in Paris, and he won in Los Angeles, in Eastbourne, in Gstaad, and the French Open. The Catalan won his first and only Grand Slam in 1972. He holds the record for the oldest male player to win the French Open (at the age of 34). In the final, he beat the French player Patrick Proisy in four sets. In addition, he reached the semifinals at Wimbledon in 1970. In 1973, he reached the final of the Dutch Open in Hilversum, where Tom Okker beat him in five sets.