Question: What country of origin does Alexei Tikhonov and Maria Petrova have in common?
Sentence (from "2009 Kremlin Cup – Women's Doubles"): Nadia Petrova and Katarina Srebotnik were the defending champions, but Srebotnik chose to participate at the BGL Luxembourg Open instead.Petrova partnered up with Maria Kirilenko, and they won in the final 6-2, 6-2 against Maria Kondratieva and Klára Zakopalová.
Relevant evidence: No