At the end of season, Seles had won 10 out of the 16 tournaments she entered (reaching the final of every tournament that she entered that year). During Wimbledon, Seles encountered difficulty because of her habit of grunting or shrieking loudly when hitting shots.
Her quarterfinal opponent Nathalie Tauziat was the first to complain to the chair umpire about it.
A month later, Seles reached the semifinals of her first Grand Slam singles tournament at the French Open, losing to then-world no. Seles finished her first year on the tour ranked world no. After a slow start at the beginning of the season, Seles went on a 36-match winning streak and won 6 consecutive tournaments starting in Miami at the Lipton Player's Championships. Seles then won her first Grand Slam singles title at the 1990 French Open. 1 Steffi Graf in the final, Seles saved four set points in a first-set tiebreaker, which she won 8–6, and went on to take the match in straight sets.Seles then won the Virginia Slims of Los Angeles title against Martina Navratilova and then defeated Navratilova again in winning the Oakland California tournament, in straight sets. 1991 was the first of two years in which Seles dominated the women's tour. She then successfully defended her French Open title, beating the former youngest-ever winner, Arantxa Sánchez Vicario, in the final.She also won the 1990 year-end Virginia Slims Championships, defeating Gabriela Sabatini in five sets (in the first five-set women's match since 1901 US National Championships), becoming the youngest to ever win the Season-Ending Championships. She started out by winning the Australian Open in January, beating Jana Novotná in the final. Unable to play at Wimbledon, suffering from shin splints, Seles took a six-week break.She then won the Virginia Slims of Chicago over Martina Navratilova in three sets.This was the last title that Seles won before the attack in Hamburg, Germany.