RIO DE JANEIRO -- This was the most bonkers, eventful, turbulent day of sevens we have seen in recent memory. The formbook wasnt just ripped up, it was shredded. At the forefront was the gargantuan shock from Japan as they defeated New Zealand, a match which saw superstar Sonny Bill Williams pick up an Olympics-ending injury. Here we round up the five key talking points from a momentous day one at the sevens.The giant killers strike againIn 2015 the Brave Blossoms, Japans 15 team then managed by Eddie Jones, turned Brighton into a sea of red and white after they caused arguably the biggest upset in the history of professional rugby when they beat the Springboks. Just under a year on and theyve done it again as they clipped the Kiwis wings, seeing them off 14-12.Like that memorable afternoon last year, this was a performance packed with heart and an ability to turn possession into points. For a team who finished 15th in the World Rugby Sevens Series, this was a remarkable result, much to the delirium of their support in the crowd. It bodes well ahead of Tokyo 2020.It is unbelievable, Japans Lomano Lemeki said moments after their win.You never see a minnow come here and beat a team which is supposed to be a gold medal contender. I am still shocked, to be honest.But having lost their second match to Great Britain -- they had a kick to draw the match with the final play -- they now need a win over Kenya on day two to stay in the mix for a spot in the quarterfinals.The wounded Kiwi is a dangerous beastAfter the womens tournament went to script with the two best sides New Zealand and Australia competing in the final, the Black Ferns male counterparts wouldve fancied their chances of going one better and claiming gold. But if they are to take the top honour here in Rio, they will have to pluck the most majestic New Zealand White rabbit out of the hat.The Japan result was the shock of day one and with Sonny Bill Williams and Joe Webber sidelined, they have lost two of their key match-winners; they are players who can turn a game on its head. But they bounced back impressively against Kenya, winning 28-5, and in front of the watching Richie McCaw they did their best to emulate his warrior spirit as they kept themselves in the tournament. Injuries can galvanise a team; underestimate the Kiwis at your peril and that win over Kenya will give them heart.Tom Mitchell pulling the strings for Team GBIt was two from two for Great Britain and the perfect start for Great Britain on day one of the sevens. Tom Mitchell, their captain, was the fulcrum around which the rest of the team pivoted. He played brilliantly as sweeper. With players like Dan Norton and Dan Bibby in their ranks, they have brilliant finishers and while their story may fly under the radar amid the events of Japans game against New Zealand, they are ticking along nicely.At the end of the day, you have to come away with the results, Mitchell said after their 21-19 win over Japan. We always go out to deliver good performances and while Japan performance wasnt as a good as wed have liked, well take the two wins, rest up tonight and go into tomorrow looking to deliver better performances and get the wins.Fiji lead the way but South Africa are going wellWith the their prime minister watching on from the stands - he sat with spare seats either side, flanked by security guards - Fiji were the most consistent side on day one. They survived the scare of playing hosts Brazil in the opener and although their lineout faltered, their cutting edge was sharper than any of the other teams. Argentina gave them a good challenge but again their class shone through.But South Africa also impressed. They eased past Spain and then dispatched the impressive France outfit in their second match. Elsewhere Argentina and Australia are still in the mix after going one from two but it is Ben Ryans Islanders who are leading the charge for gold.U.S. open with defeat but get campaign back on trackThe USA sevens side would have been left kicking themselves after their opening round defeat to Argentina. With the clock ticking towards fulltime, they were winning 14-12 only for Matias Moroni to crash over in the corner and steal the match. And all that after Argentina were reduced to five men with two sin-bins in the second-half. They lacked precision and their x-factor runner Perry Baker never got a chance to stretch his legs.But against Brazil they managed to get the key 26-0 win under the belt with a performance that saw Nate Ebner score a try and also get sin-binned. Coach Mike Friday was left underwhelmed afterwards but the team will be looking to raise their game against tournament favourites Fiji on day two as they look to book a spot in the knockouts. Cheap NCAA Jerseys Free Shipping . In the response filed Wednesday to the complaint by 30-year-old Alexander Bradley, attorneys say the former University of Florida player is invoking his Fifth Amendment right that protects people from incriminating themselves. China NCAA Jerseys . The Australian is competing in his final season in Formula One and still looking for his first win this year. He will look to end Vettels run of six straight race wins on Sunday. Webber, who is fifth in the championship, earned his second pole from the past three races and 13th of his career. http://www.cheapcollegejerseysoutlet.com/ . Coach Mike Munchak says Fokou stretched ligaments in his left knee Oct. 13 against Seattle, which could keep out up to five weeks even though the linebacker didnt need surgery. 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She was tired, had a continuous headache and was nauseous.I felt like crap, Cornett-Ching said.It was then that NASCARs medical liaison reached out to the Denver, North Carolina, resident. Even though her injury occurred in an ARCA race, she competed in five NASCAR K&N Pro Series East events earlier this year. Because she is a NASCAR-licensed driver, it was protocol for the sanctioning bodys medical liaison to check on her.The liaison immediately arranged for Cornett-Ching to visit Dr. Jerry Petty, a Charlotte-based neurosurgeon who is affiliated with the International Council of Motorsports and is an independent neurological consultant for the NFL and NFL Players Association. Petty also treated Dale Earnhardt Jr., who missed most of the NASCAR Sprint Cup season after suffering a concussion in a race in June at Michigan International Speedway. He continued racing through the July 9 Sprint Cup race at Kentucky Speedway (he finished 13th). Earnhardt has not raced since but hopes to be ready for 2017.It was the way Earnhardt handled his much-publicized injury -- by speaking out about it -- that made Cornett-Ching want to tell her story.The first visit when I went to see [Petty], I was pitiful, said Cornett-Ching, who was driven to her appointment by her team owner, Tony Blanchard. I couldnt hardly walk. I had to hold someones arm to get in there. I was so out of it that I dont even remember what was said.A CT scan showed no bleeding on her brain. After her reflexes and balance were checked, she was told to rest until the headache and nausea disappeared. She was told to stay off her cell phone unless it was a necessity and to not watch television. The bright light of the phone and TV only worsened the headaches, she said.The first three or four days, it was pretty easy to do because I felt so bad, the Summerland, British Columbia, native said. It got tougher when I started feeling better because Im pretty ambitious, and I want to get up and do things.That ambition carried Cornett-Ching to a seventh-place finish in last years ARCA point standings. This year, she recorded one top-10 finish in eight ARCA races and placed outside the top 20 only once -- in the Kentucky race that left her injured. She missed the season finale at Kansas, but Petty has told her shell be ready when the 2017 season begins at Daytona in February. Still, she cant finalize next years racing plans until shes cleared to drive.Three weeks after the accident, Cornett-Ching still wasnt allowed to drive a passenger car. Any type of stress or extensive physical activity triggered a headache and nausea. She also had problems with her short-term memory, and her brain wasnt processing things quickly.We went to Martinsville to watch a late model race [in October], and that was really tough on me, she said. We had to walk a long way and go up stairs to get to our seats. When I get my heart rate up and start doing things, I revert back to being nauseous, having headaches and being really dizzy. I really have no balance right now. If I try to walk a long way, I end upp staggering.dddddddddddd. I trip on my feet a lot.[Petty] gets me to do things, like put my thumbs together in front of my face and shake my head back and forth. I cant even do it for three seconds, and I feel like Im going to throw up. Im still a long way from being able to do physical therapy.Still, she tries to be productive. Cornett-Ching, a certified welder, has taken on tasks at her teams race shop, including peeling vinyl off one of the cars. However, when she tried to take lug nuts off a car, watching the circular motion made her sick for two or three hours, she said.Dr. Petty wants me to feel 100 percent, and then he wants me to push myself until I feel sick again, Cornett-Ching said. He wants me to keep doing that until Im good all of the time. At that point, I can start testing a car again and getting pretty much back into everything.Cornett-Ching traveled to Las Vegas for the SEMA Show scheduled for Nov. 1-4, but she had to ride cross-country with four people who were taking a show car for display. She was advised not to fly because of the stress. The event schedule calls for her to attend a press conference for Dickies, her sponsor. She also plans to be at the Dickies booth, sign autographs and make public appearances.The main thing that has me feeling positive is its not permanent. Its temporary, and every day, I feel better than I did the day before, Cornett-Ching said. I would be more scared if I didnt feel like I was getting better.Cornett-Ching initially didnt want to talk about her condition because of the implications it could have for her career. Thats understandable, said former NASCAR driver Ricky Craven, now an ESPN analyst. The first driver to admit he needed some time out of a race car to recover from a concussion, Craven said there were some risks in admitting to being compromised.You work your whole life to make it to the big leagues, said Craven, who suffered three concussions in three weeks in the late 1990s while driving in NASCAR for Hendrick Motorsports. Nobody wants a race horse with a bad ankle. The very early approach in NASCAR was toughen up. Its evolved to Youve reached your limit. You cant have these side effects and race a car, but hundreds did.Every single athlete has to be their own advocate and say, I am in charge of this, much as what you have seen Dale Earnhardt Jr. do this year. Nobody knows how I feel. I can keep it a secret or I can act on it.It happened so often that it was acknowledged, but drivers just plowed through it and strapped in the next week. Before getting hurt really badly, I can remember being in a car when I shouldnt have because I spent two days cross-eyed after I hit ... my head on the steering wheel at Charlotte.Cornett-Ching didnt hit her head on anything. She slammed into the tracks inside wall nearly head-on at 140 mph after brushing the outside wall. She never lost consciousness, but she realized she didnt have a good grasp of where she was on the track once the car stopped.Initially, I didnt want to talk about it, she said. When it comes to an opportunity to drive for a team or for a team owner, you dont want to look weak or have concussions on your résumé. At first, I didnt know what to do, but with Dale Jr. speaking out about it and taking time off ... its better to open up about it. I want people to understand what Im going through, and if they go through similar things, I hope they reach out to me. 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