Marcelo Rios defeated Mark Knowles 6-3 6-4 6-4 in the BAH vs CHI round robin on hard. The upset overturned the form book — Mark Knowles came in leading the head-to-head 1–0. Marcelo Rios claimed a first win over Mark Knowles in two meetings, levelling the head-to-head at 1–1.
Rios M. took it in straight sets.
Hard: Rios M. leads 1–0 · Grass: Knowles M. leads 1–0
Marcelo Rios beat Mark Knowles 6-3 6-4 6-4. Umpiry, "Marcelo Rios vs Mark Knowles — BAH vs CHI Round Robin", https://umpiry.com/match/2001-04-06/knowles-vs-rios-bah-vs-chi-rr?utm_source=cite (as of 6 April 2001).