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Photo: Tom Pennington via Getty Images

Great Britain claimed the gold in the mixed 4x100-meter medley relay's Olympic debut on Saturday in Tokyo.

Driving the news: The team, comprised of Kathleen Dawson, Adam Peaty, James Guy and Anna Hopkin, finished with a 3:37.58 time, a new world record. China won the silver, while Australia took the bronze.

  • Team USA, featuring Caeleb Dressel, Ryan Murphy, Lydia Jacoby and Torri Huske, finished fifth. Jacoby, whose goggles slid down her face as she jumped into the water, lost nearly 10 seconds to Peaty.

How it worked: Each team, comprised of two men and two women per country, swims the backstroke, breaststroke, butterfly and freestyle. The teams themselves decide the lineup, and which leg of the race each team member swims.

Go deeper

Updated Aug 7, 2021 - Sports

Allyson Felix becomes most decorated U.S. Olympic track athlete with 11 medals

USA's Allyson Felix reacts after winning the women's 4x400m relay final during the Tokyo Olympic Games on Aug. 7. Photo: JEWEL SAMAD / Getty Images

Team USA sprinter Allyson Felix won her 11th Olympic medal on Saturday night, making her the most decorated American Olympic athlete in track and field.

Why it matters: The win for Team USA means that Felix has topped Carl Lewis for most medals in U.S. track and field history.

American Jennifer Valente wins final women's cycling gold of Tokyo Games

Team USA's Jennifer Valente with a U.S. flag after winning the women's track cycling omnium points race during the Tokyo Olympic Games at Izu Velodrome in Izu, Japan, on Sunday. It was cycling's final gold medal available. Photo: Peter Parks/AFP via Getty Images

Team USA's Jennifer Valente won the Olympic gold medal in the women's cycling omnium event on Sunday.

The big picture: Japan's Yumi Kajihara won silver and the Netherlands' Kirsten Wild took bronze. It was Valente's second Tokyo Games medal, after winning bronze Tuesday in the team pursuit.

Go deeper: Full Axios Olympics coverage

2 hours ago - Health

Pfizer begins clinical trial for Omicron-specific COVID vaccine

A health worker in Palestine preparing a dose of the Pfizer-BioNTech's coronavirus vaccine on Jan. 24. Photo: Majdi Fathi/NurPhoto via Getty Images

Pfizer and BioNTech announced Tuesday that they have started clinical trials for a reformulated vaccine to protect against the Omicron coronavirus variant.

Why it matters: The rise of the Omicron variant has forced vaccine makers to reassess the effectiveness of their vaccines.