Samantha Stosur kept the Australian flag flying in the Olympic womens singles tennis competition with a gutsy opening round victory in Rio.While Stosur gave Australian fans something to cheer, Daria Gavrilova and mens hope Sam Groth made first round exits.Stosur got her Olympic campaign against big-hitting Latvian teenager Jelena Ostapenko off to shaky start, losing the first set in just 26 minutes, but she fought back to take the match 1-6 6-3 6-2.Her match finished under lights at the same time as Groths, who did it tough against Belgian eighth seed David Goffin 6-4 6-2.Stosur, the eighth seed, said she didnt feel she was playing too badly in the opening set but world No. 41 Ostapenko was on fire.She really wasnt missing a beat ... there wasnt a lot to do when she was playing as well as she was, Stosur said.I was able to get an early break in that second and by the end, I was dictating play compared to the first set, so it was really good for me to turn things around.Stosur will next play Japans world No.35 Misaki Doi, who overcame Yaroslava Shvedova in straight sets.Earlier in the day on centre court, Gavrilova was ousted by world No.1 Serena Williams.Gavrilova said her late night playing doubles with Stosur before her singles match took its toll.The pair had a three-set loss to Swiss combination Martina Hingis and Timea Bacsinszky.Gavrilova started well in the swirling wind on centre court against the Olympic champion but the second set was more one-sided with the American closing out the match 6-4 6-2.World No.46 Gavrilova said she ran out of steam in the second set.I got really tired in the second set at 2-1 (against Williams), Gavrilova said.I didnt have enough rest as I played pretty late and I think it affected me.You cant be flat playing against Serena because you have to run all the time.The conditions were tough on centre court with the wind, which delayed the start of play on most of the outer courts, affecting the power Gavrilova could generate from one end.Williams broke the 22-year-old to lead 4-2 but Gavrilova showed her fight, breaking the four-time Olympic medallist to love when she was serving for the first set.But Williams broke right back in the next game to wrap up that set.Playing in her fourth Olympic games, Williams said it was a tough first round encounter.The first set was really tight and the conditions didnt make it easy, Williams said.We played some wonderful points in the first set.She has a lot of big wins and she plays really well. 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Still, Brewers manager Ron Roenicke thought taking him out before the fifth inning was an unusual move. "Im looking up at the board and hes got two hits given up and one run, and Im taking him out after the fourth inning," Roenicke said. CLEVELAND -- LeBron James approached another milestone and the Cleveland Cavaliers remained unbeaten.Just another day of work for the reigning NBA champions in their 128-122 victory over the Boston Celtics on Thursday night.James scored a season-high 30 points and moved within two points of passing Hakeem Olajuwon for 10th place on the NBAs all-time scoring list.Its always humbling when youre able to put yourself in any category with guys that laid the path for you and the rest of us, James said.Olajuwon had 26,946 points, a total James will likely surpass Saturday night in Philadelphia.Hell get it, hopefully hell score two points, Cavaliers coach Tyronn Lue said with a laugh.The Cavaliers are 5-0 for the first time since 1976-77 when they started 8-0.Kevin Love scored 26 points, also a season high, while Kyrie Irving added 23 for the Cavaliers. Tristan Thompson recorded a double-double in the first half, finishing with 15 points and 14 rebounds.Isaiah Thomas scored 30 points and Avery Bradley had 26 for the Celtics, who played without two starters, center Al Horford (concussion) and forward Jae Crowder (sprained left ankle).James, who was 12 of 22 from the field, scored 20 points in the third quarter after having six at halftime. He also had 12 assists and seven rebounds, and brought the crowd to its feet in the third quarter with a fast break drunk after Irving passed the ball off the backboard.Asked what the other Cavaliers players do when James gets on a roll, Irving said, Just get out of his way. Hes capable of doing it on any given night. Weve seen it for Lord knows, how many years?The Celtics played the Cavaliers evenly for most of the first quarter, but Clevelands ball movement led to a flurry of open shots. The Cavaliers made 11 of 18 3-point attempts in the first half.I thought our defense in the first half was porous, Boston coach Brad Stevens said. Theres no excuse for that.Cleveland also matched the best start for a team James has played on since the Miami Heat were 5-0 in 2011-12 when they swept Oklahoma City in the Finals.ddddddddddddThomas didnt miss a free throw in 14 attempts. Jaylen Brown, making his first career start, scored 19 points while Marcus Smart added 14 for Boston.We played a game we felt like we couldve won, Thomas said. We didnt play that well and only lost by six.TIP-INSCeltics: Stevens said Horford is feeling better but has no timetable for his return. ... Crowder is expected to miss two weeks after being injured in Wednesdays win over Chicago.Cavaliers: Love was 12 of 13 at the free throw line. ... Cleveland didnt commit a first-quarter turnover. ... G. J.R. Smith crashed to the court after running into a screen from F Jonas Jerebko, but was still called for the foul.HIGH STAKESJames will wear a Cubs uniform when the Cavaliers play in Chicago on Dec. 2, per terms of his bet on with Dwyane Wade on the World Series. Wade would have worn an Indians jersey had they won the series, which ended with an epic Game 7 at Progressive Field on Wednesday night.Obviously to get all the way there and not be able to come out victorious, it hurts, said James, who attended Game 7. You cant say they didnt give it their all. They gave a great shot.The series also caused some debate between Stevens, a Cubs fan, and his wife, Tracy, who is from Rocky River, a Cleveland suburb. Adding to the tension, the Celtics flight from Boston to Cleveland on Wednesday night lost its internet connection in the bottom of the 10th inning.The Cavaliers gave a video tribute to the Indians on the scoreboard during the first timeout.UP NEXTCeltics: Host Denver on Sunday. Bradley averaged 23.5 points in two games against the Nuggets last season.Cavaliers: Visit Philadelphia on Saturday. Cleveland has won six straight games over the 76ers, two on the road. ' ' '