EUGENE, Ore. -- The headlines say youth is being served on the U.S. Olympic track and field team.The numbers say thats nothing new.With the second half of Olympic track trials set to start Thursday, 35 of the 50 athletes (75 percent) who have already guaranteed themselves trips to Rio de Janeiro will be going to their first Olympics. That sort of turnover is pretty much the norm. Data supplied by USA Track and Field shows an average of 53 percent turnover from year to year on the most recent world championship and Olympic teams, which essentially award the same number of spots through the same qualifying process. When the gap is two years, the turnover rate is 60 percent.This years group of newcomers includes 18-year-old high jumper Vashti Cunningham, the world indoor champion, who will be the youngest U.S. track and field athlete to qualify for the Olympics since Carol Lewis in 1980. The team also includes high jumper Chaunte Lowe and sprinter Allyson Felix, both of whom are in their 30s and going for the fourth time.You look at the system we have and the depth of talent we have, and one thing thats fairly consistent is that well have an amazing team and amazing athletes, USATF CEO Max Siegel said. Its just a matter of who the stars are going to be. Its also the challenge of how we select them.The U.S. won 29 medals at the London Olympics four years ago. That number dwindled to 18 at last years world championships, raising alarm among some in track circles.Over the years, the USATF has settled on a system in which the top three finishers in each event make it, assuming they have met an Olympic qualifying standard. There are no exceptions for injuries or past performances the way there are in many countries, including Jamaica, where Usain Bolt will almost certainly be on the team despite pulling out of Jamaicas qualifier with a hamstring injury.It may be the fairest system, but, as decathlete Ashton Eaton said, if the goal is to send the best team, Im not sure the trials method is the best method.For instance, a tangle of feet in the stretch of the womens 800-meter final knocked out Brenda Martinez and Alysia Montano, either of whom wouldve contended for medals. Making it instead were three first-timers: Kate Grace, Ajee Wilson and Chrishuna Williams.Surreal, said Grace, who was ranked seventh nationally coming into trials but had a gold medal around her neck Monday night. Ive never podiumed at a national event, and now Im going to the Olympics. I knew I could run at this level even though Id never done it before.A few strange twists aside, most of these newcomers have been setting themselves up for success for years leading up to the Olympics. A look at some U.S. first-timers with the best chances of bringing home hardware from Rio:SAM KENDRICKS: The 23-year-old pole vaulter actually flew to Eugene in 2012, expecting to compete at the Olympic trials then. By the time he landed, he learned that hed been scratched from the field by a few late entrants who ranked higher than he did. He watched from the stands, and said that was the prime motivator to reach this point: Hes currently ranked second in the world.TORI BOWIE: The 25-year-old said her grandmother essentially rescued her as an infant by taking her in from a foster home. Bowies favorite sport was basketball, but her grandmother pushed her into track, a move that has paid off. She won the 100-meter bronze medal at world championships last year and should contend in Rio. Also in the sprint mix: English Gardner.JOE KOVACS: The 27-year-old is the defending world champion in shot put. He finished fourth at Olympic trials in 2012. Growing up, Kovacs was a football player who just used track and field to stay in shape. But then he started taking it more seriously. Kovacs shot put coach as a kid: his mother, Joanna.TRAYVON BROMELL: World-indoor champion at 60 meters and tied for bronze at 100 meters in Beijing. At 5-foot-9, will be looking up -- way up -- at the 6-foot-5 Bolt in the starting block. Bromells U.S. teammate, Justin Gatlin, is considered the biggest threat to the Jamaican, but the 20-year-old from Baylor ran 9.84 seconds in the trials, second best in the world this year, on a sore Achilles.EMILY INFELD: She may have only the 32nd-best time at 10,000 meters this year, but you can never count her out. 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Mackensie Alexander Jersey SAN DIEGO -- For 13 seasons, right-handed sluggers have peppered the Western Metal Supply Co. building in the left-field corner at Petco Park, driving home runs into the three decks and off the facade.No one had hit a home run to land on the roof until San Diego Padres rookie Hunter Renfroe did it Wednesday night.His two-run shot went an estimated 435 feet and helped carry the Padres to a 6-5 victory against the NL West champion Los Angeles Dodgers.A home runs a home run, honestly, said Renfroe, who seemed unimpressed by his mammoth shot with one out in the third off rookie Jose De Leon. I guess its probably pretty cool to be the first one to do it. `Renfroe, the MVP of the Triple-A Pacific Coast League, has had an impressive debut since he was called up from Triple-A El Paso on Sept. 21, hitting four home runs and driving in 12 runs in seven games.Itll be hard for him to top the homer that landed atop the brick warehouse, a remnant from the skid row neighborhood that made way for Petco Park, which opened in 2004.You really dont feel anything. Its kind of a like a `spat and then it goes. It disappears real quick and you kind of know its a home a run, said Renfroe, who was the MVP of the Triple-A Pacific Coast League.Renfroe drove in all seven runs in Tuesday nights 7-1 win, on his first grand slam and a three-run homer. The three-run blast was a moonshot to left.Then came his roof shot.It was impressive, manager Andy Green said. I think we all know hes got a ton of raw power. I wasnt expecting that. But I guess maybe he did miss the one yesterday out to left. I guess he didnt hit it on the barrel, if thats what the barrel does. Its impressive power. Its a great start for him and Im sure hes pleased to get off on that right foot.Dodgers manager Dave Roberts said the home run came off pretty hot. This kid has power and is swinging the bat really well. You make a mistake and get it over, he is going to make you pay.De Leon said Renfroe is pretty powerful. You have to tip your hat to him. The pitch was in where we wanted and he just got the head out and it was a monster shot. There iss nothing you can do about that.ddddddddddddLos Angeles remains two games behind the Washington Nationals in the race for home-field advantage for their division series matchup, with four to play.The Dodgers lost despite hitting three home runs off rookie Luis Perdomo (9-10), who had three of four starts coming in. Brandon Maurer pitched the ninth for his 13th save.Chase Utley hit a leadoff homer to left and Adrian Gonzalez add a solo shot deep into the seats in right with two outs in the first.The Padres took a 3-2 lead off De Leon after loading the bases with one out in first. Renfroe hit a two-run single and rookie Ryan Schimpf followed with an RBI double.Gonzalez hit an RBI double to tie it in the third before Renfroe gave the Padres a 5-3 lead with his homer.The Dodgers tied it on Joc Pedersons two-run homer to right in the fourth.San Diego regained the lead in the bottom of the inning when rookie Manuel Margot doubled off Ross Stripling (5-9) and scored on Wil Myers groundout.Perdomo allowed five runs and seven hits in five innings, struck out two and walked one.Perdomo was a Rule 5 draft pick who had never pitched above A ball.His futures really bright, Green said. I think its a really impressive season for a guy who came from A ball last year and spent most of the year in low A. Were really pleased. I know today he would have loved to have had a better last outing but he kept us in the game to get a win. That says something about his development.De Leon allowed five runs, three earned on four hits in 2 1/3 innings, struck out one and walked three.TRAINERS ROOMDodgers: The team said LHP Hyun-Jin Ryu underwent an arthroscopic cleanup of his left elbow, performed by Dr. Neal ElAttrache in Los Angeles. He is expected to be ready for the 2017 season.UP NEXTDodgers: LHP Julio Urias (5-2, 3.53) is back in the rotation, scheduled to make his first start since Sept. 13.Padres: LHP Christian Friedrich (5-11, 4.66) is scheduled to start the series finale. China Jerseys Cheap Wholesale Jerseys 2020 Wholesale Jerseys China Cheap NFL Jerseys China Wholesale Jerseys 2020 Cheap NFL Jerseys Wholesale Cheap Jerseys Online ' ' '