What is the longest rally ever in tennis?

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Tags

1. #according
2. #match
3. #rally
4. #richmond
5. #tournament
6. #which
7. #tennislovers
8. #minutes
9. #vicky
10. #longest
11. #concluded
12. #point
13. #hepner
14. #between
15. #october
16. #times
17. #tiebreak
18. #nelson