Titmus, Doncic make memorable Olympic debuts

United States men's 4x100m freestyle relay team Bowen Beck, Blake Pieroni, and Caeleb Dressel celebrate after winning the gold medal at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

United States' Ally Carda pitches against Japan in the first inning of a softball game at the 2020 Summer Olympics, Monday, July 26, 2021, in Yokohama, Japan. (AP Photo/Sue Ogrocki)

From left, silver medalist Rayssa Leal of Brazil, gold medalist Momiji Nishiya of Japan, center, and bronze medalist Funa Nakayama of Japan show their medals won in the women's street skateboarding finals at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Ben Curtis)

Slovenia's Luka Doncic top, fights for a rebound with Argentina's Luca Vildoza during a men's basketball preliminary round game at the 2020 Summer Olympics, Monday, July 26, 2021, in Saitama, Japan. (Gregory Shamus/Pool Photo via AP)

Arthur Margelidon of Canada and Tohar Butbul of Israel compete during their men's -73kg repechage contest judo match, at the 2020 Summer Olympics in Tokyo, Japan, Monday, July 26, 2021. (AP Photo/Vincent Thian)

Naomi Osaka, of Japan, returns to Viktorija Golubic, of Switzerland, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ariarne Titmus of Australia celebrates after winning the final of the women's 400-meters freestyle at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Slovenia's Luka Doncic (77) celebrates scoring by a teammate during men's basketball preliminary round game against Argentina at the 2020 Summer Olympics, Monday, July 26, 2021, in Saitama, Japan. (AP Photo/Eric Gay)

United States team members cheer in the sixth inning of a softball game against Japan at the 2020 Summer Olympics, Monday, July 26, 2021, in Yokohama, Japan. (AP Photo/Sue Ogrocki)

Canada's Quinn, left, and Chile's Karen Araya battle for the ball during a women's soccer match at the 2020 Summer Olympics, Saturday, July 24, 2021, in Sapporo, Japan. (AP Photo/Silvia Izquierdo)