Conversation so far:
Who was Rod Laver's biggest rival?
Ken Rosewall.
What other rivals did he have?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Including tournaments and one-night stands, they played over 130 matches.

Question: Who did he play 130 matches against?
Self-contained rewrite: Who did Rod Laver play 130 matches against?