Bianca Andreescu advanced when Katie Swan retired 6-1 in the Australian Open qualifying round of 128.
Andreescu B. advanced when Swan K. retired.
Andreescu B. and Swan K. faced 1 of the same opponent in the last 12 months. Andreescu B. went 0–1 (0%) against them, Swan K. 1–0 (100%).
Only 1 common opponent — too few for any conclusion. Shown without assessment.
Bianca Andreescu beat Katie Swan 6-1 after Katie Swan retired. Umpiry, "Bianca Andreescu vs Katie Swan — Australian Open Qualifying Round of 128", https://umpiry.com/match/2019-01-09/andreescu-vs-swan-australian-open-q128?utm_source=cite (as of 9 January 2019).