Marcelo Rios defeated Jens Knippschild 4-6 6-4 6-4 7-5 in the US Open round of 64 on hard. The result followed the form book — Marcelo Rios came in leading the head-to-head 2–0, defending last year's round of 16. Marcelo Rios extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-19 | Stuttgart Outdoor | R16 | clay | Marcelo Rios | 6-4 6-4 |
| 1998-07-20 | Stuttgart Outdoor | R32 | clay | Marcelo Rios | 7-6(5) 6-2 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (165 vs 41). ATP, WTA & Challenger.