5 Steffi Graf records that will likely never be broken

Only singles player to win the Grand Slam on three diferent surfaces

She won the US Open after hard courts were introduced at the tournament

5 women have held all four Majors in a calendar year, and Graf is one of them. What is unique to Graf, however, is the fact that she is the only one to have achieved the feat across three surfaces.

The US Open was played on grass courts prior to the introduction of hard courts at the tournament, a change that took place in 1978.

Graf won all of her Majors after that year, making her the only player, male or female, to have won the singles Grand Slam across three surfaces.