Czech Republic's Tomas Machac hits a return to Italy's Jannik Sinner during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner hits a return to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner hits a return to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner reacts after a point against Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner hits a return to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner hits a return to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner (L) serves to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)

Italy's Jannik Sinner hits a return to Czech Republic's Tomas Machac during their men's singles semi-final match at the Shanghai Masters tennis tournament in Shanghai on October 12, 2024. (Photo by HECTOR RETAMAL / AFP) (Photo by HECTOR RETAMAL/AFP via Getty Images)