Steffi Graf Amelia Island final on clay, Graf lost her first match of the year to Sabatini but returned to European clay with easy victories at Hamburg and Berlin. Graf's Grand Slam tournament winning streak ended at the French Open, where 17-year-old Spaniard Arantxa Sánchez Vicario beat Graf in three sets. Graf served for the match at 5–3 in the third set but lost the game and won only three more points in the match. Suffering from food poisoning, she had struggled to beat Monica Seles in their semifinal 6–3, 3–6, 6–3 and said that she had had menstrual cramps in the
Steffi Graf in the final 7–5, 2–0 before winning the match 5–7, 6–2, 6–1. She then won tournaments in Hamburg and Mahwah (where she lost only eight games all tournament). At the US Open, Graf beat Sabatini in a three-set final to win the Grand Slam by 6–3, 3–6, 6–1, a feat previously performed by only two other women, Maureen Connolly Brinker in 1953 and Margaret Court in 1970. Graf's 1988 Grand Slam remains the only one in history completed on three surfaces (grass, clay, hard court), as all other Grand Slams in tennis history were achieved prior to the introduction of