Maria Kirilenko defeated Tatjana Maria 6-3 6-4 in the Toronto qualifying round of 64 on hard.
Kirilenko M. took it in straight sets.
Kirilenko M. and Maria T. faced 4 of the same opponents in the last 12 months. Kirilenko M. went 2–3 (40%) against them, Maria T. 2–2 (50%). Only 1 of the comparisons are context-comparable — too few for a conclusion.
Only 4 common opponents — small sample, treat as indicative.
Maria Kirilenko beat Tatjana Maria 6-3 6-4. Umpiry, "Maria Kirilenko vs Tatjana Maria — Toronto Qualifying Round of 64", https://umpiry.com/match/2009-08-15/kirilenko-vs-maria-toronto-q64?utm_source=cite (as of 15 August 2009).