The Big 4 of mens tennis is enthusiastic about their sports place in the Olympics, unlike their counterparts in golf.Novak Djokovic, Andy Murray, Roger Federer and Rafael Nadal all have participated in the Summer Games in the past, all own a medal, and all talk about that events importance to tennis every four years -- even if it already has four Grand Slam tournaments every year.And while Federer wont be in Rio, its only because he is sitting out the rest of the season entirely to protect his surgically repaired left knee.To get a sense of how these guys think, consider what Britains Murray said when he was asked about Brazil the day after winning Wimbledon for the second time.Ive loved being in the two Olympics that Ive been at, said the No. 2-ranked Murray, who won a gold in singles at the 2012 London Games. Rio is obviously a big, big goal of mine, and hopefully I can perform well there.The No. 1-ranked Djokovic won a singles bronze for Serbia at the 2008 Beijing Games, then came up just short of a medal four years ago.No. 3 Federer won gold for Switzerland in doubles with Stan Wawrinka eight years ago, and a silver in singles four years ago.No. 4 Nadal won a singles gold for Spain in Beijing, missed London because he was hurt, and appealed to the International Tennis Federation to allow him to compete in Rio after he failed to fulfill Davis Cup commitments because of injuries.Even if this quartet owns a combined 46 Grand Slam titles, the Olympics still matter to them. Much will be made of the contrast between this groups interest in the Summer Games and what happened in golf, which will be missing Jordan Spieth, Jason Day, Dustin Johnson and Rory McIlroy in Rio.Olympic Games are the most renowned and most prominent sports event in the history of sport. No question about it. There is no bigger sports event than Olympic Games, Djokovic said. For me, as a professional athlete, its a huge honor to be part of it.Here are some things to know about tennis at the Rio Olympics:WHOS MISSINGThere are some noteworthy players in addition to Federer who wont be there: Bob and Mike Bryan, the American twins who won gold in doubles four years ago, plus nine of the top 22 men in the July 25 ATP singles rankings. That includes Wimbledon runner-up Milos Raonic of Canada; Wimbledon semifinalist Tomas Berdych of the Czech Republic; the top American man, John Isner; Australias best two tennis players, Nick Kyrgios and Bernard Tomic; and Dominic Thiem, who would have given Austria a chance at a medal. Four of the top 20 women are missing, as is five-time major champion Maria Sharapova, who is serving a doping ban.MIXING IT UPNo one will know exactly who is competing in mixed doubles until everyone is in Rio. Thats because the sign-in happens there. Its limited to 16 teams, and the possibilities are intriguing. The expectation is that, if hes healthy, Nadal will team with French Open champion Garbine Muguruza. The bad news: It sounds as if the Williams sisters will not enter that event.AGE IS JUST A NUMBERIf 34-year-old Serena Williams or 36-year-old Venus Williams wins a gold medal, either would be the third-oldest woman to collect an Olympic title in tennis. Winifred McNair was 43 when she won womens doubles for Britain all the way back in 1920, and Hazel Wightman was 37 when she won the same event for the U.S. four years later. Each Williams already owns four medals (all gold), so adding two more -- theyre both entered in singles and doubles -- would put either in first place for most tennis medals in Olympic history. Kathleen McKane won five medals (one gold) in the 1920s.MOST APPEARANCESIndias Leander Paes will be appearing in his record-extending seventh Olympic tennis competition, pairing in mens doubles with Rohan Bopanna. Paes owns one medal, a bronze in singles at the 1996 Atlanta Games. In Grand Slam action, he has won eight titles in mens doubles, and another 10 in mixed doubles.BACK-TO-BACK?No player has won two consecutive gold medals in singles. Murray and Serena Williams will try to change that this time.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrichCheap Nike NFL Jerseys Free Shipping . The home side created most of the chances but struggled to break down Braunschweigs resilient defence, resulting in the Bundesligas 1,000th scoreless draw. Wholesale NFL Jerseys China . PETERSBURG, Fla. https://www.chinajerseysnfl.us/ . A knee to the thigh might have stung him the most, but his sixth straight double-double made up for the brief burst of pain. 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Or at least the very, very tall ones.Cleveland Cavaliers forward?LeBron James joined Clinton at a campaign event in Cleveland on Sunday, dwarfing the Democratic presidential nominee as he pushed Ohioans to support her at the polls.As a child growing up in inner-city Akron, the 6-foot-8 NBA star said he believed our vote doesnt matter.But it really does, he said.Standing beside -- and somewhat below -- James, Clinton praised his work on the court and for improving the lives of children through his foundation.What he does off the court is to care for every child as though that child is his own, she said.Clinton added: I will be on your side. I will fight for you.Though she has spent most of her campaign running as President Barack Obamas successor, vowing to continue the first black presidents legacy, Clinton has struggled to motivate black voters. In early voting, they have turned out in lower numbers than the record black turnout in 2008 and 2012 that helped fuel Obamas historic candidacy. The slump could hurt her in swing states, like Ohio and Pennsylvania, where urban, black turnout is crucial for Democrats.On Sunday morning, Clinton stopped by an African-American church in solidly Democratic northwest Philadelphia to warn parishioners that everything they care about is on the balllot.ddddddddddddThis election is about doing everything we can to stop a movement to destroy President Obamas legacy, she told voters at Mount Airy Church of God in Christ.But her team feels particularly concerned about Ohio, where polls show her in a dead heat with her Republican rival, Donald Trump. On Friday, she appeared at a free concert featuring rapper Jay Z and his wife, Beyonce Carter Knowles, in Cleveland.LeBron, who helped end Clevelands championship drought earlier this summer by winning a title with the Cavaliers, endorsed Clinton last month in an op-ed article in which he argued she would be a champion for children and improve life for African-Americans. A father of three, James said he returned to Ohio from the Miami Heat in 2014 with two missions: to win a championship and help area children.Only one person running truly understands the struggles of an Akron child born into poverty, wrote James, who grew up poor in that city and has started a foundation to improve educational outcomes for at-risk children in his hometown.He campaigned for Obama in 2008.James isnt the only athlete weighing in on the 2016 race. Golfer John Daly, former football star Herschel Walker, former professional wrestler Hulk Hogan and former basketball coach Bob Knight have endorsed Trump. 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