Thiago Monteiro defeated Alexandre Muller 6-4 6-4 in the Lisboa CH round of 32 on clay. The upset overturned the form book — Alexandre Muller came in ranked #133. Thiago Monteiro extended the head-to-head to 2–0.
Monteiro T. took it in straight sets.
Thiago Monteiro beat Alexandre Muller 6-4 6-4. Umpiry, "Thiago Monteiro vs Alexandre Muller — Lisboa CH Round of 32", https://umpiry.com/match/2021-09-27/monteiro-vs-muller-lisboa-ch-r32?utm_source=cite (as of 27 September 2021).