RIO DE JANEIRO -- Juan Martin del Potro bounced the ball, waiting to try to serve out his second-round match at the Olympic tennis tournament.Argentine fans sang for him. Brazilians chanted for his opponent, seeking to drown out their rivals. Boos and whistles and shushes echoed around center court.Please, the chair umpire said into his microphone, imploring spectators for some quiet.There has been little of that at the Olympic Tennis Center in Rio de Janeiro. While crowds are sparse for many sports, theyve been healthy for tennis -- and often far louder than the number of folks in the stands would suggest.Wimbledon, this is not.Its different when you play in Europe -- the people are more calm, Brazilian player Thomaz Bellucci said. In Brazil, people get crazy, and its very nice.Jeering is common, and fans often yell out in the middle of a point or as a player is about to serve -- no-nos in tennis.Sometimes we dont know exactly when its OK to cheer, acknowledged Mauricio Vieira, a 40-year-old Brazilian fan who attended del Potros first-round match against top-ranked Novak Djokovic. You have to understand, our point of reference is soccer.And that point of reference is to be raucous -- all the time.We are not used to these kinds of sports, so we watch it as we know it, said 34-year-old Vanessa Pessoa, who works in project management. We make a lot of noise because its who we are.Players have mostly enjoyed the atmosphere, even when its gone against them. Some of the loudest roars so far came on the second-largest court, where the Brazilian doubles team of Bellucci and Andre Sa upset second-seeded brothers Andy and Jamie Murray of Britain in the first round Sunday.It beats playing in front of two men and a dog, said Jamie Murray, whose regular doubles partner, Bruno Soares, is Brazilian.Other than rooting for Brazilian players and against Argentines -- as del Petro experienced in his first two matches -- the home fans can be unpredictable in their allegiances. The objects of their cheers and jeers can shift from set to set, game to game and even point to point.They play with the players: If you win the point, they start screaming, Bellucci said after his first-round singles match.They seem to like the big names, but also underdogs. They love showmanship and, perhaps not surprisingly, passion. Serena Williams earned her biggest roars in her first-round match for her loudest bellows of Come on! But when she smashed a racket in her second-round match, boos rained down.Its different than your average tennis crowd, Williams said. I like it.In sister Venus first-round match, the crowd swung to the side of her diminutive opponent, 61st-ranked Kirsten Flipkens of Belgium, stoked by her drop shots and her will to rally from a big deficit.Goosebumps all over the place, from the first to the last second, Flipkens said.They just enjoyed my game because, I think, Im a little girl trying to do some special stuff to get a chance to beat a champion like that, she added.During that match, some spectators tried to start a U-S-A! chant that was quickly drowned out by boos. The Brazilian crowd directed some of its loudest derision toward Belluccis first-round opponent, Dustin Brown, the dreadlocked German whos typically a fan favorite.But when Brown twisted his ankle and then tried to play through the injury, cheers poured down from the stands.Bellucci said he had never experienced anything like the atmosphere that day on center court. Home matches in Davis Cup -- the head-to-head competitions between mens national teams -- generally draw 2,000-3,000 fans, Bellucci added.Even non-Brazilian players have little to compare this to. The only similar setting Flipkens could remember in her career was the 2006 Fed Cup final -- the womens national-team competition -- that Belgium hosted.Frances Jo-Wilfried Tsonga, who had the crowd both for and against him in his first-round win, said the atmosphere was far livelier than at the 2012 London Olympics.They give us emotions, so thats good, he said.Rio hosts a clay-court tournament in the winter that draws a handful of top players. At the Olympics, though, many spectators seem to be novices at watching tennis -- but not at sports fandom.Who is not shouting has problems. Its too much fun, said Clarisse Lopes, a 30-year-old psychologist attending her first pro tennis tournament. Its not every day we get to see a Djokovic or Serena Williams play in our country. This is such a treat, and we dont have a better way of expressing it.---AP Tennis Writer Howard Fendrich and Associated Press writer Adriana Gomez Licon contributed to this report. 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Once again, DeLaet finished tied for second at a PGA Tour stop on the weekend, this time at the Waste Management Phoenix Open. The pride of Weyburn, Sask. SARATOGA SPRINGS, N.Y. -- Trainer Chad Brown got his 2016 Saratoga meeting off to the same flying start as last summer, winning the opening-day feature, the $200,000 Lake George, for the second year in a row, this time with the undefeated Ancient Secret.Brown sent out the first two finishers in Fridays Grade 2 Lake George, with Elyseas World rallying to be second, 1-1/4 lengths behind her stablemate and a length in front of the late-running Outsider Art. Brown won the 2015 Lake George with Mrs McDougal.Ancient Secret was the third of four winners on the card for jockey Irad Ortiz Jr.Ancient Secret entered the 1-1/16-mile Lake George perfect in three starts but was racing for the first time around two turns and for the first time beyond a mile. She rated kindly for Ortiz, three lengths off the early pace dictated by Sky My Sky, moved readily to challenge for command three wide into the stretch, and, after edging clear, maintained a safe advantage to the end.Elyseas World raced near the rear of the field for six furlongs, brushed briefly with Thundering Sky while attempting to split rivals with her bid near midstretch, and conntinued willingly to be second-best.ddddddddddddAncient Secret is a New York-bred daughter of Kantharos owned by Alpha Delta Stable. She completed the distance over a firm course in 1:40.35 and returned $6.40 in the scratch-reduced field of 8 3-year-old fillies.Winning the Lake George two years in a row is great and takes a lot of pressure off right away, said Brown. At least we wont get shut out for the meet.Brown said he was impressed with Ancient Secrets performance.This filly ran really well, said Brown. Shes a remarkable little horse. She always trained like a real quality animal. We gave her little incremental goals, and shes hit them all. I wasnt really sure about the two turns, but she passed the test.Brown also was happy with Elyseas World.I thought she ran terrific, Brown said. I was happy to see her get back into form. Her last race, I think I ran her back too soon, and she probably didnt like being inside late in the race today. Both fillies will go back in a graded stakes somewhere. ' ' '