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.

Question: Who did Graf play for in her exhibition matches?
Self-contained rewrite: Who did Steffi Graf play for in her exhibition matches in Late 1999 and early 2000?