Andrea Pellegrino advanced when Andrej Martin retired 7-6 1-0 in the Lisboa CH semi-final.
Pellegrino A. advanced when Martin A. retired.
Andrea Pellegrino beat Andrej Martin 7-6 1-0 after Andrej Martin retired. Umpiry, "Andrea Pellegrino vs Andrej Martin — Lisboa CH Semi-final", https://umpiry.com/match/2021-09-27/martin-vs-pellegrino-lisboa-ch-sf?utm_source=cite (as of 27 September 2021).