College basketball: 7-foot C Evan Mobley, the No. 1 overall prospect in the ESPN 100 for 2020, announced his commitment to USC. Mobley’s father, Eric, is an assistant coach for the Trojans, and his older brother, Isaiah, is an incoming freshman for the program. Isaiah, a 6-9 forward, was the No. 16 prospect for 2019.

College football: Georgia sophomore LB Brenton Cox entered the transfer portal, ESPN reported. Cox, an Atlanta native and the No. 11 prospect in the ESPN 300 for 2018, played in 13 of 14 games last season and finished with 20 tackles. He had a career-high six tackles in the Bulldogs’ 28-21 loss to Texas in the Sugar Bowl after starting in place of injured starter D’Andre Walker.

NBA: Eight-time All-Star G Vince Carter agreed to a one-year contract to return to the Hawks for his final season, ESPN reported. Financial terms of the deal weren’t yet available. Carter, 42, will play a league-record 22nd season. He will pass Dirk Nowitzki, Kevin Garnett, Kevin Willis and Robert Parish, all of whom played 21 seasons. Carter averaged 7.4 points and 17 minutes in 76 games last season and has averaged 17 points per game for his career. He also has played for the Raptors, Nets, Mavericks, Grizzlies, Magic, Kings and Suns. ... The Grizzlies hired former Notre Dame women’s associate head coach Niele Ivey, 41, as an assistant under Taylor Jenkins. There are now nine women assistant coaches in the league.

NHL: The Lightning signed D Kevin Shattenkirk to a one-year, $1.7 million contract. Shattenkirk, 30, had seven goals and 44 assists over 119 games the last two seasons with the Rangers, who bought out his contract last week. In his career, Shattenkirk has 75 goals, 349 points and 368 penalty minutes in 609 regular-season games and five goals and 34 points in 60 playoff games. He was an All-Star with the Blues in 2015.

Soccer: Lionel Messi will miss Barcelona’s exhibition games against Napoli in the U.S. after leaving his first preseason training session with the two-time defending La Liga champs because of a strained right calf. The club didn’t say when it expected Messi to return to action. Barca and Napoli play Thursday in Miami Gardens, Fla., and Saturday in Ann Arbor, Mich. Barca opens its league season against Athletic Bilbao on Aug. 17. ... Manchester United signed center back Harry Maguire, 26, to a six-year contract with an option for a seventh season. United agreed to pay Leicester $97 million, a world-record fee for a defenseman.

Tennis: Saisai Zheng of China beat Aryna Sabalenka of Belarus 6-3, 7-6 (3) to win the Silicon Valley Classic on Sunday in San Jose, Calif. It was the first career WTA title for the 25-year-old Zheng. She moved up from 55th in the world to a career-best 38th when the new rankings were released Monday.

Also: The IBF formally ordered Sergiy Derevyanchenko and Gennady Golovkin to meet for its vacant middleweight world title. The 160-pound world championship was stripped from Canelo Alvarez on Thursday when his team didn’t finalize a deal with mandatory challenger Derevyanchenko. The Derevyanchenko and Golovkin camps have until Sept. 4 to make a deal, and then have another 15 days to submit signed contracts to the IBF for the fight that is slated to take place Oct. 5. ... Starting with this year’s tournaments, the reigning U.S. Amateur and U.S. Women’s Amateur champions will be able to use their exemptions in the following year’s U.S. Open and U.S. Women’s Open even if they decide to turn pro. In the past, the reigning winners of the amateur golf championships received exemptions in the U.S. Open and U.S. Women’s Open only if they maintained their amateur status.

— News services