“You’re going now to the statistics and saying that it might be fixed because there is a market?” he said. “You’re writing news or fairy tales? So for me, it’s like I don’t even want to talk about it. I talked to the T.I.U.; I respect their work. I gave all the information needed, and at the end of the day what’s going to happen is: I’m not involved in anything.”

Dolgopolov appeared more hesitant when asked if he had ever been approached by anyone seeking to fix a match. “Uh, no, not really,” he said. “I don’t have a lot of friends on social networks.”

He then lashed out when a reporter pressed him on that vague reply. “You come to me after a five-set match and the only thing you ask about is betting patterns, if I’ve been approached?” he said. “Can you ask something normal?”

The concern about the prevalence of match fixing in tennis and the effectiveness of those who investigate it peaked at the Australian Open last year, after reports of possible match fixing at that tournament and in years past. Tennis governing bodies announced an independent review of their efforts before that tournament had ended; the commission still has not reported its initial findings, but is expected to later this year.

The T.I.U. has banned three players for life for match fixing this year, but all with puny rankings: 931st, 1,536th, and 1,997th. There has never been an ATP-level player convicted of a fixing offense by the T.I.U.

Marco Cecchinato of Italy, ranked 102nd, was banned for 18 months by the Italian tennis federation last year, but that conviction was overturned after the federation missed a deadline during his appeals process. The T.I.U. could still hand down sanctions.

At Wimbledon this year, the first Grand Slam main draw that Cecchinato played after his ban was lifted, he refused to answer any questions about his case or its current status.