Conversation so far:
When did Steffi Graf start her post career exhibition matches?
Late 1999 and early 2000, as part of her Farewell Tour, Steffi Graf played exhibition matches against former rivals in New Zealand, Japan, Spain, Germany and South Africa.
Who did Steffi Graf play for in her exhibition matches in Late 1999 and early 2000?
Germany
Did Steffi Graf perform well in her exhibition matches in Late 1999 and early 2000?
In 2000, Steffi Graf played against Kimiko Date in Tokyo, winning in three sets. In 2004, Graf dispatched her former doubles partner Gabriela Sabatini in straight sets.
Did Steffi Graf play for charity during her exhibition career?
In Berlin Steffi Graf hosted a charity gala, as well as inaugurating a tennis stadium renamed the Steffi Graf Stadion. Proceeds from her match went to Children for Tomorrow.
Did Steffi Graf play in the United States at all?
In July 2005, Steffi Graf competed in one tie of World Team Tennis on the Houston Wranglers team.
When did Steffi Graf play her last exhibition?
In 2010, Steffi Graf participated in the WTT Smash Hits exhibition in Washington, D.C. to support the Elton John AIDS Foundation.
What else did Steffi Graf do besides play tennis?

Question: What is something that stands out about her exhibition career?
Self-contained rewrite: What is something that stands out about Steffi Graf's exhibition career?