![WTA on Instagram: “September 10, 1988! Steffi Graf wins the #USOpen to complete the Calendar Grand Slam!” | Steffi graf, Beautiful athletes, Softball training WTA on Instagram: “September 10, 1988! Steffi Graf wins the #USOpen to complete the Calendar Grand Slam!” | Steffi graf, Beautiful athletes, Softball training](https://i.pinimg.com/736x/3a/e6/bd/3ae6bda0190950a8ac8e3cd2da29de71--steffi-graff-baseball-training.jpg)
WTA on Instagram: “September 10, 1988! Steffi Graf wins the #USOpen to complete the Calendar Grand Slam!” | Steffi graf, Beautiful athletes, Softball training
![Steffi Graf (GER) competing at the 1988 US Open in the year she won the Golden Slam Stock Photo - Alamy Steffi Graf (GER) competing at the 1988 US Open in the year she won the Golden Slam Stock Photo - Alamy](https://c8.alamy.com/comp/FD334A/steffi-graf-ger-competing-at-the-1988-us-open-in-the-year-she-won-FD334A.jpg)
Steffi Graf (GER) competing at the 1988 US Open in the year she won the Golden Slam Stock Photo - Alamy
![DW Sports on Twitter: "🥇 1988 Steffi Graf 🥇 1992 Michael Stich, Boris Becker 🥇 2021 Alexander Zverev German tennis history 🇩🇪 #Tokyo2020 https://t.co/dFRBIEa0PS" / Twitter DW Sports on Twitter: "🥇 1988 Steffi Graf 🥇 1992 Michael Stich, Boris Becker 🥇 2021 Alexander Zverev German tennis history 🇩🇪 #Tokyo2020 https://t.co/dFRBIEa0PS" / Twitter](https://pbs.twimg.com/media/E7ssQq_XsAkPkDd.jpg)