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 San Diego, Graf reached the US Open final, where she lost in straight sets to Sabatini. Graf won four indoor tournaments after the US Open, including a pair of straight set wins over Sabatini in the finals of Zürich and Worcester. Although Sabatini got the best of Graf in the semifinals of the season-ending Virginia Slims Championships, Graf still finished the year as the top-ranked player. A mixture of injury problems, personal difficulties, and loss of form made 1991 a tough year for Graf. Seles established herself as the new dominant player on the women's tour, winning the Australian Open,