What record did Martina Hingis set during the 1990s?
Youngest-ever Grand Slam champion and youngest-ever world No. 1
First woman to win a Grand Slam in the Open Era
First player to win a calendar-year Grand Slam
First player to win 100 singles titles
Answer
During the 1990s, Martina Hingis set a series of "youngest-ever" records, including becoming the youngest-ever Grand Slam champion and youngest-ever world No. 1. These achievements highlight her early dominance in the sport.
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