NEW YORK, NEW YORK - AUGUST 30: Carlos Alcaraz of Spain has a discussion with Stan Wawrinka of Switzerland about which side of the racket handle is up or down before spinning it to decide who serves first during a practice session match before his first round match at USTA Billie Jean King National Tennis Center on August 30, 2026 in New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NEW YORK - AUGUST 30: Carlos Alcaraz of Spain has a discussion with Stan Wawrinka of Switzerland about which side of the racket handle is up or down before spinning it to decide who serves first during a practice session match before his first round match at USTA Billie Jean King National Tennis Center on August 30, 2026 in New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Jack Kennedy of the United States reacts against Lloyd Harris of South Africa during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Jack Kennedy of the United States reacts against Lloyd Harris of South Africa during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - AUGUST 30: Carlos Alcaraz of Spain and his coach Samuel Lopez have a discussion with Stan Wawrinka of Switzerland about which side of the racket handle is up or down before spinning it to decide who serves first during a practice session match before his first round match at USTA Billie Jean King National Tennis Center on August 30, 2026 in New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NEW YORK - AUGUST 30: Carlos Alcaraz of Spain and his coach Samuel Lopez have a discussion with Stan Wawrinka of Switzerland about which side of the racket handle is up or down before spinning it to decide who serves first during a practice session match before his first round match at USTA Billie Jean King National Tennis Center on August 30, 2026 in New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK, NEW YORK - AUGUST 30: Carlos Alcaraz of Spain and his coach Samuel Lopez have a discussion with Stan Wawrinka of Switzerland about which side of the racket handle is up or down before spinning it to decide who serves first during a practice session match before his first round match at USTA Billie Jean King National Tennis Center on August 30, 2026 in New York City. (Photo by Clive Brunskill/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Jack Kennedy of the United States returns against Lloyd Harris of South Africa during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)