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Sizikova and American Brengle went on to lose the contest to the Romanian pairing 7-6 (8), 6-4.
Vice-president of the Russian Tennis Federation Alexei Selivanenko said on Sunday: “As long as there are no official documents, it is too early to comment on anything. Tennis has a zero-tolerance policy for cases of this kind.”
The Tennis Investigation Unit (TIU) has not commented on the matter with the investigation ongoing.