LAKE BUENA VISTA, Fla. (AP) — The Dallas Mavericks are without big man Kristaps Porzingis (KRIHS’-tahps pohr-ZIHN’-gihs) for Game 4 against the Los Angeles Clippers because he has right knee soreness. The last-minute scratch occurred after the Mavericks learned that guard Luka Doncic (DAHN’-chihch) would play Sunday despite a left ankle sprain.Porzingis is averaging 23.7 points and 8.7 rebounds in the Western Conference first-round series. He is coming off a Game 3 performance in which he had 34 points and 13 rebounds. It’s the first time a Dallas player has scored 30 or more points and grabbed 10 or more rebounds since Dirk Nowitzki in the 2011 NBA Finals.The 7-foot-3 Porzingis has been dealing with a bruised left heel. In other NBA news: Jayson Tatum added 28 points and had a playoff career-high 15 rebounds for Boston, which advances to Eastern Conference semifinals and a meeting with the winner of the first-round matchup between Toronto and Brooklyn. Boston’s win marks the first sweep in 15 playoff series meetings between the teams. It also is the third straight season that Philadelphia has failed to advance past the second round.Joel Embiid (joh-EHL’ ehm-BEED’) led the 76ers with 30 points and 10 rebounds. Tobias Harris added 20 points and five rebounds despite leaving briefly after a scary fall that bloodied his left eye. NBA-NEWSMavs forward Porzingis sits out Game 4 with sore right knee The Capitals are still considered championship contenders, and captain Alex Ovechkin has one year remaining on his contract.Reirden was another first-time NHL head coach hired during the Ovechkin era. Trotz was the only one with previous experience and the only coach to get Washington past the second round, let alone win the Cup.NFL-NEWSNFL asks lab to check reliability of its COVID-19 testsUNDATED (AP) — The NFL has asked a New Jersey lab to investigate a new batch of COVID-19 test results amid reports from several teams of false positives. The league didn’t identify which teams got positive results, or how many there were. Share This StoryFacebookTwitteremailPrintLinkedinRedditNBA PLAYOFFSWalker’s 32 lifts Celtics to 110-106 win, sweep of 76ersLAKE BUENA VISTA, Fla. (AP) — Kemba Walker scored 32 points and the Boston Celtics pulled away in fourth quarter to complete a first-round series sweep of the Philadelphia 76ers 110-106 on Sunday. Update on the latest sports Pence was a fiery emotional leader for the Giants from 2012-2018, helping anchor teams that won the World Series in 2012 and 2014. After making the All-Star team with Texas last season, he returned to San Francisco in February on a one-year, $3 million contract but hit just .096 with two homers and six RBI in 17 games.Robertson will report to the Giants’ alternate training site in Sacramento. The team also reinstated reliever Sam Coonrod from the 10-day injured list.In other baseball news:— The Los Angeles Angels will face the Cleveland Indians in Williamsport, Pennsylvania, in the 2021 Little League Classic. Major League Baseball announced the matchup Sunday. The game is scheduled for Aug. 22 at Bowman Field in front of a crowd predominantly made up of players, coaches and parents in Williamsport for the Little League World Series. Cleveland will be the home team. The first Little League Classic pitted the Pittsburgh Pirates against the St. Louis Cardinals in 2017, and the event has been held annually since. This year’s game between the Baltimore Orioles and Boston was canceled due to the coronavirus pandemic.NHL-CAPITALS-REIRDEN FIRED August 23, 2020 Turner went 3 for 3 and scored two runs. Rookie Luis Garcia also had three hits and scored three times for the Nationals, who have alternated wins and losses over their last 10 games.MLB-NEWSGiants designate Pence for assignment, get Rays’ RobertsonUNDATED (AP) — The San Francisco Giants cut ties with outfielder Hunter Pence on Sunday, ending a second stint with the fan favorite that didn’t go nearly as well as his first.The 37-year-old was designated for assignment to clear a spot on the 40-man roster for utility man Daniel Robertson, who was acquired earlier in the day from the Tampa Bay Rays for cash or a player to be named later. Among teams reporting false positives, the Minnesota Vikings said they had 12, the New York Jets 10 and the Chicago Bears nine. Other teams that were affected are the Buffalo Bills, Pittsburgh Steelers, Philadelphia Eagles and Cleveland Browns. The NFL asked the New Jersey lab BioReference to investigate the results “while the clubs work to confirm or rule out the positive tests.” The Jets canceled a walk-through on Saturday night but had a full practice Sunday morning after the previously positive tests came back negative. The Bears moved their practice scheduled for Sunday morning to the afternoon.The Steelers said they had six false positives and those players will be back at practice Monday. The Eagles held out four players from working out Sunday. The Browns initially canceled their practice, but after re-testing turned up negative tests they decided to hold their workout.In other NFL news: Capitals fire coach Todd Reirden after 2 postseason letdownsWASHINGTON (AP) — The Washington Capitals have fired coach Todd Reirden after a second consecutive first-round exit in the playoffs.General manager Brian MacLellan announced the move Sunday, three days after the Capitals lost to former coach Barry Trotz’s New York Islanders in a five-game series.Washington opted to promote Reirden from the top assistant job and let Trotz leave rather than give him a raise after winning the Stanley Cup in 2018. Trotz’s Islanders reached the second round of the postseason for a second consecutive season. The Capitals failed to advance past the first in back-to-back years for the first time since 2013 and 2014. Djokovic remained in the singles draw, where he is seeded No. 1 and is scheduled to play his second-round match Monday. He received a first-round bye.The Western & Southern Open is the first ATP tournament since the tour went on hiatus in March because of the coronavirus pandemic. It normally is played in Ohio but is being held this year on the same hard courts that will host the U.S. Open starting Aug. 31 as part of an unusual doubleheader. Associated Press — The Baltimore Ravens have terminated the contract of seven-time Pro Bowl safety Earl Thomas, who got involved in a fight with a teammate Friday and did not attend practice Saturday. According to a statement released today by the team, Thomas was released “for personal conduct that adversely affected the Baltimore Ravens.” The action stems from Thomas’ fray with defensive back Chuck Clark at practice after Thomas admittedly blew a coverage assignment. — Washington released Cody Latimer on Sunday amid his legal issues before he practiced a single snap with the team. The veteran wide receiver signed a contract with Washington during the offseason. He was arrested in May and charged with a felony count of illegal discharge of a firearm. He also faces charges of second-degree assault, menacing, prohibited use of a weapon and reckless endangerment. He was also released after posting bond. The 27-year-old was put on the NFL’s Commissioner Exempt List last month. — The Arizona Cardinals have signed veteran cornerback Dre Kirkpatrick to boost their secondary after a season-ending injury to Robert Alford. The Cardinals announced on Sunday that Kirkpatrick has agreed to a one-year deal. The 30-year-old spent the first eight seasons of his career with the Cincinnati Bengals and was a starter during the last five. He’s played in 99 games, including 67 starts and has 10 career interceptions.— The Detroit Lions have signed defensive end Will Clarke, adding much-needed depth at the position. He joined the team for practice on Sunday. Clarke has seven career sacks in 53 NFL games. The Lions released guard Caleb Benenoch to clear a spot on the roster. Cincinnati drafted Clarke in the third round in 2014. Clarke spent his first three seasons in the league with the Bengals. He played in 18 games with the Tampa Bay Buccaneers from 2017 to 2018. Clarke played for the St. Louis BattleHawks in the XFL last year. — The banged-up New York Jets received a boost on the practice field with the returns of linebacker Avery Williamson and tight ends Ryan Griffin and Daniel Brown to team drills. Williamson and Griffin opened training camp on the active/physically unable to perform list. Williamson injured a knee last summer and Griffin hurt an ankle late last season. Brown was on the non-football injury list with an ankle injury. It completed one of the most unlikely wins in the tournament’s history. Popov is ranked No. 304 and dropped off the LPGA Tour last year. She hadn’t previously won on the LPGA Tour, the second-tier Symetra Tour or on the Ladies European Tour.The winner’s check of $675,000 is more than six times her entire career earnings before Sunday.ATP-WESTERN & SOUTHERN OPENDjokovic out of doubles, citing neck, at Western & SouthernNEW YORK (AP) — Novak Djokovic (NOH’-vak JOH’-kuh-vich) pulled out of the doubles event at the Western & Southern Open on Sunday, citing neck pain. — One key member of the New England Patriots’ offense has returned to practice, but another remains limited despite the team’s assurances that he would be ready to go. Wide receiver N’Keal Harry was back on the field for Sunday’s practice in shells and shorts, but second-year quarterback Jarrett Stidham was held back during combined team drills after also being limited Friday.WOMEN’S BRITISH OPEN304th-ranked Popov wins Women’s British Open for 1st majorTROON, Scotland (AP) — Sophia Popov became the first female golfer from Germany to capture a major title when she won the Women’s British Open by two strokes at Royal Troon on Sunday. Popov, who went into the final round with a three-shot lead, bounced back from bogeying the first hole by making five birdies in her 3-under 68. Jasmine Suwannapura was the runner-up after shooting 67. — Orlando Magic forward James Ennis and Milwaukee Bucks forward Marvin Williams have been fined $15,000 each for a fight that led to their ejections from Game 3 of their teams’ first-round playoff series. Ennis and Williams had been competing for rebounding position midway through the second quarter of the Bucks’ 121-107 victory. They exchanged shoves as they headed back up the floor. The top-seeded Bucks have a 2-1 lead in the best-of-seven series. Game 4 is scheduled for Monday.MLB-SCHEDULESánchez pitches Nationals past Marlins 9-3UNDATED (AP) — Aníbal Sánchez pitched seven effective innings, Trea Turner drove in three runs and the Washington Nationals beat the Miami Marlins 9-3 on Sunday.Sánchez allowed one run and five hits in his longest outing of the season. The veteran right-hander went 0-2 with a 9.00 ERA in his first three starts this month.