First skateboarding medal: The street and park competitions made their debuts in Tokyo, and the host country dominated, with three of four gold medals won by Momiji Nishiya (women’s street), Sakura Yosozumi (women’s park) and Yuto Horigome (men’s street).
First women’s 1,500-meter freestyle: Katie Ledecky won the race finally added to the Olympic program, inserted in part because of her dominance in the event. She won gold in 15 minutes 37.34 seconds, ahead of teammate Erica Sullivan at 15:41.41, for one of her four medals in Tokyo.
First track and field gold medal for India: The world’s second-most-populous nation has competed in the Summer Olympics since 1900 and sent 192 athletes in track and field but had never won a gold medal until Neeraj Chopra did so in the javelin.
First mixed-medley relay in swimming: Britain won the mixed-medley relay in world record time, while the Americans finished in a disappointing fifth.
First basketball players to win five golds: Sue Bird and Diana Taurasi continued to lead the dominant U.S. women’s team, which has won 55 straight games after its gold medal triumph over Japan.
First gold medal for Philippines: In women’s weightlifting, Hidilyn Diaz gave her country of 108 million people its first Olympic gold medal after 97 years of trying. She set two Olympic records in the 55-kilogram division.
First medals of any kind for San Marino: San Marino (population 34,000) became the smallest country ever to medal. In shooting, Alessandra Perilli won bronze in the women’s trap competition, while the mixed team won silver in team trap. Myles Nazem Amine won bronze in men’s freestyle wrestling at 86 kilograms.
First out trans athlete to medal: Quinn earned a gold medal as part of the Canadian women’s soccer team, which outlasted Sweden in penalty kicks for its first gold medal.
First surfing medal: Honolulu native Carissa Moore, a member of surfing’s hall of fame, won gold on the women’s side. Brazil’s Italo Ferreira won the men’s competition.
First gold medals for Qatar: Qatar’s first gold medals came in a pair, with Mutaz Essa Barshim winning the men’s high jump (and sharing the honor with his friend Gianmarco Tamberi of Italy) and Fares Elbakh taking the men’s weightlifting competition at 96 kilograms.
First medal of any kind for Turkmenistan: Polina Guryeva gave Turkmenistan — an isolated country located in Central Asia along the Caspian Sea and mostly covered in desert — its first medal with silver in women’s weightlifting at 59 kilograms.
First gold medal for Bermuda: Flora Duffy won the women’s triathlon for the island’s first gold medal. Bermuda entered this year with one Olympic medal, a bronze from 1976 in heavyweight boxing.
First karate medal: Karate joined the Olympics in the country where it was born, and Okinawa native Ryo Kiyuna, a three-time world champion, won gold in men’s kata.
First Black woman to win gold in wrestling: Tamyra Mensah-Stock defeated Nigeria’s Blessing Oborududu in the women’s 68-kilogram freestyle final, also becoming the second American woman to win gold in wrestling.
First sport climbing medal: Spain’s Alberto Ginés López, just 18 years old, won the men’s combined competition, while Janja Garnbret of Slovenia earned gold on the women’s side.
First medal of any kind for Burkina Faso: By earning third in the men’s triple jump, Hugues Fabrice Zango put his country on the podium for the first time.