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RIO DE JANEIRO -- Katie Ledecky is racing herself in the 400-meter freestyle.Yulia Efimova and the U.S. mens relay team are just glad to have a shot at a medal.Coming back after anchoring the Americans to a relay silver on the opening day of swimming, Ledecky nearly broke her own world record in the preliminaries Sunday, setting herself up as the overwhelming favorite to capture her first gold medal of the Rio de Janeiro Olympics.Ledecky posted a time of 3 minutes, 58.71 seconds, actually backing off a bit on the closing lap to conserve energy for the late-night final. She just missed her mark of 3:58.37 set in 2014.No one is even close to Ledecky. The next-fastest qualifier was Britains Jazz Carlin, who was more than 4 seconds behind.Thats the easiest its felt to go under 4 minutes, Ledecky said, barely breathing hard. So that bodes well for tonight.Efimova heard a smattering of boos at the Olympic Aquatics Stadium after winning her heat, having only been cleared to compete days before the games.Revelations of a state-sponsored doping system in her native Russia led to Efimova being banned from Rio because of a previous 16-month suspension for doping, not to mention another positive test this year for the now-banned substance meldonium. That result was placed on hold while world anti-doping officials conduct further studies on the drug.After appealing their penalties, Efimova and up to six other Russian swimmers were quietly approved to compete in Rio. She posted the second-fastest time in the preliminaries at 1:05.79, just one-hundredth of a second behind American Lilly King.Stopping briefly in the mixed zone, the reigning world champion answered a single question from The Associated Press.Well, I dont know what to say, Efimova said, smiling and shrugging her shoulders. I mean, I was crazy the last half-year and just dont understand whats going on and everything. Im just happy to be here and Im ready to race.When pressed on criticism from rival swimmers and coaches, she smiled and walked away.Meanwhile, the Americans made up for a debacle at last years world championships by easily qualifying for the final of the mens 4x100 freestyle relay.The team of Jimmy Feigen, Ryan Held, Blake Pieroni and Anthony Ervin posted the second-fastest time in the prelims at 3:12.38.Russia was the top qualifier at 3:12.04, setting up what figures to be a thrilling, four-country fight for the gold medal. Australia and defending Olympic champion France are also in the mix after qualifying third and fourth.Now, the real fun begins as the countries break out their big guns for the evening final. The U.S. figures to come back with Nathan Adrian, Caeleb Dressel and 18-time gold medalist Michael Phelps, who could be joined by Ervin after the 35-year-old posted the fastest individual time in the prelims (47.65).Australia rested up Cameron McEvoy, France has Florent Manaudou in reserve, while Russia can turn to Vladimir Morozov -- another of the doping-tainted swimmers given last-minute approval to compete in Rio.The U.S. didnt even qualify for the final of the 4x100 free relay last year at the worlds in Kazan, an embarrassing setback for the worlds most dominant swimming nation.Thats ancient history, man, Ervin said.Assuming Phelps joins the relay for the final, as hes done at the last three Olympics, hell have a good shot to add to his already staggering haul of 18 golds and 22 medals overall.In other preliminaries, Kathleen Baker of the U.S. was fastest in the womens 100 backstroke, Chinas Sun Yang led the way in the mens 200 freestyle and Camille Lacourt of France set the pace in the mens 100 back.---Follow Paul Newberry on Twitter at www.twitter.com/pnewberry1963 . 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Yasmani Grandal Brewers Jersey .com) - The women will also have a new champion at the Australian Open.MINNEAPOLIS -- Minnesota Vikings?running back Adrian Peterson suffered a torn meniscus in his right knee during Sundays?17-14 victory over the Green Bay Packers, Vikings head coach Mike Zimmer said Monday.Zimmer, who said a timetable for Petersons return is uncertain, did not rule out the running back playing this week and said the team is looking at several options.?Hes sitting down with the doctors and [head athletic trainer Eric Sugarman], Zimmer said.Peterson slightly twisted his knee at the end of a 5-yard run. His right foot was briefly stuck under the upper leg of Kyler Fackrell as the Packers linebacker brought him to the ground. Peterson left with 3:32 to play in the third quarter.He hobbled off the field with the assistance of athletic trainers. After being examined on the sideline, Peterson hopped through a field-level club at the teams new stadium toward the Vikings locker room.Upon arriving in the locker room, Peterson was quickly ruled out.He was later seen using crutches with a large black brace around the knee.The 2015 NFL rushing leader, who had just 19 carries for 31 yards last week against the Tennessee Titans, was injured on his longest run of the night.He had gained only 19 yards on 12 carries, although his presence had helped Vikings quarterback Sam Bradford hit Stefon Diggs on a pair of long strikes when the Packers were loading up to stop Peterson.ddddddddddddPeterson suffered a devastating left knee injury in 2011 -- tearing both his ACL and MCL -- only to bounce back and rush for 2,097 yards in the 2012 regular season. If Peterson were unable to play against the Carolina Panthers on Sunday, the Vikings could turn to Matt Asiata and Jerick McKinnon, who combined to run for 1,108 yards in 2014 while Peterson missed 15 games because of NFL discipline.I have a lot of confidence in those two guys, Zimmer said. Theyre both different types of runners, but I think the combination of the two can help us.The injury to Peterson is the latest blow to the Vikings, who saw quarterback Teddy Bridgewater tear multiple knee ligaments on Aug. 30 and started the season with two different quarterbacks after trading for Bradford on Sept. 3. The Vikings, though, are 2-0 and in sole possession of first place in the NFC North.Everything we do is for the team. Were not going to be the only team to have injuries, Zimmer said. So were going to keep plugging away. ' ' '