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WIMBLEDON, England — Though Cori Gauff is only 15, tennis people in the know have been speaking in hushed tones about her talent for years.

With her precocious blend of power, athleticism, court savvy and competitive drive, Gauff was the youngest United States Open junior girls finalist in history at age 13 and the second youngest French Open junior girls champion at age 14.

But even if potential is abundantly clear, it is never clear how a teenager will handle the moment when she takes the court at the highest level against an established champion.

On Monday, tennis got an emphatic answer as Gauff, displaying remarkable poise, upset Venus Williams, 6-4, 6-4, in the first round of Wimbledon.