All about: Osaka vs Serena Williams, Continental Cup, Michael Johnson recovering from 'stroke'

Following is a summary of current sports news briefs.

Athletics: Price power gives Americas early lead in Continental Cup

DeAnna Price of the United States beat world record holder Anita Wlodarczyk in the hammer throw on Saturday, helping lift the Americas into the lead on the first day of the Continental Cup. In the women's 100m, Ivory Coast's Marie Josee Ta Lou edged British rival Dina Asher-Smith to give Africa its first victory at the two-day global team track and field competition.

MLB notebook: Red Sox to activate Sale on Tuesday

The Boston Red Sox plan to activate ace Chris Sale on Tuesday for a start against the Toronto Blue Jays. Sale, who last pitched on Aug. 12, will be heavily restricted in his return, according to manager Alex Cora.

NASCAR notebook: Stenhouse Jr. faces all-or-nothing Sunday

Roush Fenway Ford driver Ricky Stenhouse Jr. knows both ends of the spectrum. Last year, with breakthrough victories at Talladega and Daytona, he locked himself into the Monster Energy NASCAR Cup Series playoffs long before the final regular-season race at Richmond.

Djokovic and Del Potro set for big clash of styles in U.S. Open final

Novak Djokovic heads into his U.S. Open final clash with Juan Martin del Potro on Sunday knowing he faces a challenge - a very big challenge indeed. "He's a big-time player. He's a big-match player. He's a Grand Slam winner. He's playing tennis of his life, without a doubt, in the last 15 months," Djokovic said on Friday of his "dear friend" Del Potro.

NBA notebook: Celts' Jabari Bird could face multiple charges

Boston Celtics guard Jabari Bird is expected to appear in court Monday after his arrest Friday night for an alleged domestic violence incident in Brighton, Mass., that could lead to multiple charges, including assault and battery, strangulation and kidnapping, according to Boston.com. Bird is under police watch at a Boston-area hospital, according to the Boston Police Department on Saturday. The alleged victim, whose name was not released, is being treated at a separate hospital.

Osaka beats Serena to win first Grand Slam title

Naomi Osaka became the first Japanese player to win a Grand Slam singles title when she beat Serena Williams 6-2 6-4 in the U.S. Open final on Saturday. Osaka, 20, prevailed in the first major final of her career, thus preventing Williams from winning a record-equaling 24th Grand Slam title.

Cardinals RB Johnson signs 3-year, $39 million extension

A star running back agreed to a contract extension with his team on the eve of the first NFL Sunday of the season. No, it wasn't Le'Veon Bell of the Pittsburgh Steelers.

Murray, Mattek-Sands win U.S. Open mixed doubles

Britian's Jamie Murray and American Bethanie Mattek-Sands captured the U.S. Open mixed doubles title with a 2-6 6-3 11-9 victory over Croatia's Nikola Mektic and Poland's Alicja Rosolska on Sunday. The victory made Murray, who won here last year with Martina Hingis, the first man to win consecutive U.S. Open mixed doubles titles since Bob Bryan in 2003-04.

Olympic great Johnson recovering from 'mini stroke'

Michael Johnson is recovering from a 'mini stroke', the Olympic champion and former world record-holder said on Twitter on Saturday but expects to make a full recovery. "Last week I rather surprisingly suffered what's known as a Transient Ischemic Attack or mini stroke," the 50-year-old American tweeted.

NFL notebook: Steelers RB Bell absent, gives up $853,000

Le'Veon Bell gave up $853,000 by not reporting to the Pittsburgh Steelers before Saturday's 4 p.m. ET deadline as his contract holdout continues. Bell did not sign his one-year, $14.54 million franchise tender after the Steelers retained him in March using the franchise tag. The two sides failed to reach agreement despite negotiating toward a long-term contract in July. Based on the value of the franchise tender, Bell would earn $853K for every game this season.