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. Marqise Lee Womens Jersey .ca looks back at the stories and moments that made the year memorable. Quincy Williams II Womens Jersey .J. -- New York Giants wide receiver Victor Cruz will miss the rest of the season after having surgery on his left knee. http://www.officialjacksonvillejaguarspro.com/Yannick-ngakoue-jaguars-jersey/ . In the lead up - which seemed to begin the moment Mike Geiger blew the whistle in Houston last Thursday night - the Impact rumour mill went into overdrive. The speculation went into meltdown mode, of the golden nugget variety. Marqise Lee Jersey . -- Quarterback Will Finch threw for 252 yards and three touchdowns, and Yannick Harou rushed in two scores as the No. Josh Allen Jaguars Jersey . -- Kyrie Irvings last-minute 3-pointer helped seal another victory for Cleveland -- and the Cavaliers longest winning streak since LeBron James left. Collingwood are on the hunt for their fifth football boss since 2013 after the resignation of Graeme Allan following his AFL ban.The latest change comes at a critical time for the Magpies, with coach Nathan Buckley needing a big season from the team next year to ensure he keeps his job.Collingwood were among the big losers out of Tuesdays AFL Commission meeting, with Allan falling on his sword shortly after he accepted a 12-month AFL ban for his part in the Lachie Whitfield affair.His departure is a blow for Magpies president Eddie McGuire, who was pivotal in luring him from Greater Western Sydney this year.McGuire will enter his 19th season in charge next year - a full decade more than the next longest-serving current club president, Adelaides Rob Chapman.McGuire railed against media reports suggesting his position was under pressure.What is going to happen and what I can see from one hundred miles, is that papers, the cricket is no good and they want to get a story going, McGuire said on Triple M on Wednesday.And the story that they are all trying to rev up is that Collingwood (are in) disarray and Im under pressure etcetera.It is not happening. It is a made-up attack on the football club and me.Geoff Walsh, one of the key figures in Collingwoods 2010 premiership, left his role as Magpies football manager in 2013.Since then Rodney Eade, Neil Balme and most recently Allan have filled the role.Now Collingwood football operations manager Marcus Wagner will have the job on an interim basis while they look for a full-time replacement.ddddddddddddAllan, the Giants football boss at the time, was banned after Whitfield stayed at then-GWS welfare manager Craig Lamberts house for three days in May last year, allegedly to avoid a potential drug test.The trio were ultimately penalised for breaching the AFLs rules and not the anti-doping code.Whitfield will miss seven games of the 2017 season after accepting a six-month ban and Lambert has copped a 12-month suspension, with all sanctions ticked off by ASADA.Allan only replaced Balme in August after initially joining the club in a more development-based role in May, with the Pies aware he was under investigation when they hired him.But in accepting his resignation, the club revealed they were not made fully aware of all facets of the investigation.Collingwood received from Allan, in the form of a statutory declaration, a satisfactory account of the events in question, a club statement read.Collingwood was not aware or informed of the fact the matter was with the Australian Sports Anti-Doping Authority at the time of Allans appointment.Balme has since been appointed football chief at Richmond, with Allans absence leaving Collingwoods football department in a parlous state heading into a make-or-break year for Buckley. 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