In this photo released by the Moscow City Court Press Service, Stephen Hubbard, a U.S. citizen accused of fighting as a mercenary in Ukraine against Russia sits in a glass cage during a court session in the Moscow City court in Moscow, Russia, Monday, Oct. 7, 2024. (Moscow City Court Press Service via AP)

Taylor Fritz of the United States serves against Terence Atmane of France during the men's singles second round match in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Taylor Fritz of the United States reacts during the men's singles second round match against Terence Atmane of France in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Grigor Dimitrov of Bulgaria reacts during the men's singles second round match against Zizou Bergs of Belgium in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Terence Atmane of France reacts during the men's singles second round match against Taylor Fritz of the United States in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Taylor Fritz of the United States, right, is congratulated by Terence Atmane of France after winning in the men's singles second round match in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Grigor Dimitrov of Bulgaria returns a shot to Zizou Bergs of Belgium during the men's singles second round match in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)

Grigor Dimitrov of Bulgaria, right, is congratulated by Zizou Bergs of Belgium after winning in the men's singles second round match in the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Monday, Oct. 7, 2024. (AP Photo/Andy Wong)