'If we're both fit enough, why not?' Carlos Alcaraz and Rafael Nadal reaffirm Paris Olympic doubles hopes in Madrid

John Isner was in no mood for good behavior in Acapulco on Monday night. The world No. 22 dropped his opening round to fellow American Steve Johnson, 6-4, 6-4. Along the way, Inser destroyed one of his racquets like it was no stronger than a twig.

Long labeled the top American male, the 31-year-old has been surpassed by No. 18-ranked Jack Sock. Johnson isn't far behind at No. 26.

Isner was the eighth seed at the ATP 500 event.

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WATCH: Isner smashes his racquet in half

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WATCH: Isner smashes his racquet in half