Gauff faces Britain's Francesca Jones on Tuesday, while Williams begins her 20th Wimbledon campaign against Aliaksandra Sasnovich of Belarus.
The Tampa Bay Lightning defeated the Montreal Canadiens 5-1 in Game 1 on Monday night.
The seven-time All-Star dropped a playoff career-high 41 points as the Clippers won 116-102 to avoid elimination.
A draw would be enough for Argentina to win Group A as long as Paraguay fails to beat Uruguay.
The Team U.S.A. quartet includes Biles, Lee and Olympic debutants Jordan Chiles and Grace McCallum.
World No. 1 Novak Djokovic looks highly likely to equal the all-time record of 20 Grand Slam singles titles held by Roger Federer and Rafael Nadal.
The four-time Olympic gold medalist could become the first woman gymnast to defend her all around Olympic title next month.
Brazil is the only team to have won all its games, while Ecuador needs at least a draw to reach the quarterfinals.
England faces Germany on Tuesday, while defending champion Portugal takes on Belgium, the No.1-ranked team in the world.
Laurel Hubbard will become the first transgender woman to compete at the Olympics after being selected in New Zealand's weightlifting team for the Tokyo Games.
The 22-year-old point guard became the joint youngest player in NBA history, tied with LeBron James, to score at least 48 points in an Eastern Conference Finals game.
The defending champions hope to make it three wins in three games and punch their ticket to the knockout stage.
The Detroit Pistons will hold the No. 1 pick in next month's draft, with the Houston Rockets and Orlando Magic picking second and third.
The L.A. Clippers lost 104-103 in Game 2 of the Western Conference Finals against the Phoenix Suns after George missed the chance to seal the game.
The 2020 NBA champion was apprehended on Tuesday while trying to board a flight at Easterwood Airport in College Station, Texas.
The Houston Rockets, Detroit Pistons and Orlando Magic all have a 14 percent chance of landing the first overall pick in the 2021 NBA Draft.
Argentina and Chile are already through to the quarterfinals, but Uruguay has work to do after an underwhelming start.
The offensive lineman was suspended by the Miami Dolphins following an investigation into alleged bullying of second-round draft pick Jonathan Martin.
The Las Vegas Raiders defensive end made the announcement on Monday, June 21, becoming the first publicly gay player in the NFL.
Barcelona's Lionel Messi looks set to equal Javier Mascherano's all-time record of 147 appearances, as Argentina try to book a spot in the knockout stage.
The Phoenix Suns lead the LA Clippers 1-0 in the Western Conference Finals, while the Eastern Conference Finals begins on Wednesday, June 23.
The Sixers point guard finished with just five points as Philadelphia lost Game 7 at home against the Atlanta Hawks.
The Spaniard won his maiden major after shooting 4-under par in the final round at Torrey Pines on Sunday.
June 21 marks the longest day in the Northern Hemisphere and the official beginning of the astronomical summer.
The longest day of the year falls on June 21, but celebrations at the historical site in England have again be toned down because of COVID-19.
The climax of the NCAA baseball season gets underway on Saturday at TD Ameritrade Park in Omaha, Nebraska.
The oldest soccer rivalry in South America resumes on Friday in Brasilia, when Uruguay makes its tournament debut.
The reigning PGA Championship winner shot 4-over par in the opening round, while three-time major winner Jordan Spieth finished at 6-over par.
Cristiano Ronaldo and Manuel Locatelli irked UEFA after removing bottles of Coca-Cola during their press conferences.
Russell Henley and Louis Oosthuizen lead the way at Torrey Pines, with Brooks Koepka and Jon Rahm two shots adrift.