LONDON -- Youve just played the match of your life, ending Novak Djokovics 30-match Grand Slam winning streak. How do you possibly summon the strength and concentration required to follow that up -- against an unseeded Frenchman ranked No. 51 in the world?Oddly enough, it wasnt a problem Monday for smiling, happy-go-lucky Sam Querrey, who is playing like he doesnt fully comprehend where he is.A single shot captured his uncanny verve and nerve on the way to the Wimbledon quarterfinals: With Nicolas Mahut serving at 4-5, 15-all in the first set, Querrey was forced to retreat from the net when Mahut struck a beautiful lob, high and deep. Querrey raced back to the baseline, turned swiftly and ripped a savage cross-court forehand. Mahut, transfixed, could only get a frame on it.The No. 28-seeded Querrey went on to score the decisive break and went on to win the match 6-4, 7-6 (5), 6-4.It was a match I wanted to win to make it to the quarterfinals, Querrey said. If I didnt win, there would have been a lot of, `Wow, it was kind of a fluky match against Novak because you didnt back it up.I feel like I did a really good job of putting my head down and playing really well today.And so for Querrey, a 28-year-old Californian, the glorious run continues. He has made some personal history here, becoming:? A Grand Slam quarterfinalist for the first time, on his 38th try.? The first American to reach the quarters at Wimbledon since Mardy Fish in 2011.? The first U.S. man to reach the quarters at any Slam in nearly five years, going back to John Isner and Andy Roddick at the 2011 US Open.After beating Djokovic, Querrey got the expected flood of texts from family and friends -- and admitted he wasnt afraid to re-experience that marvelous moment by watching SportsCenter.Im not going to lie, Querrey said. After the Novak match, I watched every highlight I could, over and over. Enjoyed the hell out of that moment.For me, the win was real exciting. But my match today, I was playing for my first [major] quarterfinal. There was still something exciting, like another carrot on the line for me to play for.Mahuts brush with fame came here six years ago when he was on the losing end of that 70-68 fifth set with Isner. After the longest match in tennis history, the 34-year-old Frenchman acquitted himself well, graciously, patiently answering questions on a daily basis.What casual tennis fans probably didnt know is that Mahut is something of a wizard when the surface is grass. All five of his finals appearances (and three titles) have come on grass. His career record is 150-186 (.446), but a spiffy 63-34 (.649) on grass. Hes also half of the No. 1-seeded doubles team here, with fellow Frenchman Pierre-Hugues Herbert.Curiously, Mahut had also beaten Querrey in their two previous meetings, at the 2015 US Open and a few weeks ago in The Netherlands on grass. Mahut, an agile and forward-moving athlete, has a rare affinity for picking up those low, skidding balls that Wimbledon presents.Mahut was still hanging around in the second set, which wound up in a tiebreaker. Querrey hit an unreturnable serve for a 5-4 lead and went up 6-4 when Mahut sent a forehand long. He converted his second set point while standing at net, tapping a forehand into the open court.On a day reserved for fireworks in the States, Querreys serve sizzled. He hit 83 serves, and 43 of them did not come back. Thats a phenomenal percentage of 52 percent -- a lot of free points. He had 23 aces, and through four matches is at 97, second to Isners 114.Querrey finished it famously; the last three points were all emphatic aces.Over his career, Querrey has developed a reputation for playing less than his best when the stakes are highest. Here at Wimbledon, he has been a different man.After beating Djokovic on Wimbledons second-largest court, No. 1 Court, the intimacy of Court 18 -- it features only 800 seats -- might have been a blessing for Querrey.I was fine with whatever court they threw me on today, he said. You know, I havent felt many nerves yet this week. I think Im kind of over that almost. Hopefully, will just kind of play freely and have fun and play big and hopefully get another win.Hes sitting at the very top of the mens draw, waiting for the Milos Raonic-David Goffin match to produce his next opponent. So far, Smiling Sam has made this run through some heavy metal look like a stroll across the street in sprawling Wimbledon Park.Querrey will have a rare day off Tuesday. His team will make every effort to keep him loose and unaware of the dizzying heights his play has taken him to. 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With rival clubs readying recruiting raids, Greater Western Sydney will again be a key player in the AFL trade period.That wont be news to the talent-laden Giants, who are already resigned to losing homesick forward Cam McCarthy to a Western Australian club - most likely Fremantle - and promising key-position player Caleb Marchbank, who has requested a trade to Carlton.With the dust still settling on the Western Bulldogs stunning grand final win, attention will quickly turn to the trade period that runs from Monday October 10 to Thursday, October 20, and the free agency signing period, that starts on Friday October 7 and runs for 10 days.GWS played hardball with McCarthy a year ago when he requested a trade to his native Perth, with the talented forward choosing to sit out the AFL season when a trade didnt materialise.Marchbank, the sixth overall pick at the 2014 draft, put in a trade request to return to Victoria, with the Blues his desired destination.The club will work closely with both Greater Western Sydney and Calebs management to come to a suitable arrangement, Carlton list manager Stephen Silvagni said in a statement.That pair wont be the only Giants enquired about by other clubs, with Adam Tomlinson, Jack Steele and Will Hoskin-Elliott also likely to attract interest.GWS are also reportedly interested in dealing with Essendon to secure the No.1 pick at this years draft, which would be the fourthh top overall pick in the clubs short history.ddddddddddddThe coming trade and free agency periods promise to be amongst the busiest ever seen.Jaeger OMeara and Dion Prestia both want out of Gold Coast, with Hawthorn and Richmond their respective destinations of choice.The Hawks will need to be adequately compensated by Fremantle if Brad Hill is to get his wish to cross the continent to play with his brother, Stephen.Melbourne say they are comfortable with where Jesse Hogans contract situation sits, but speculation continues that both Perth clubs will try to make the Demons an offer they cant refuse for the talented young forward.Intrigue also surrounds the futures of North Melbourne trio Brent Harvey, Nick Dal Santo and Drew Petrie, who were all let go by the Roos.Petrie has attracted interest from West Coast, while Harvey and Dal Santo are still considering their futures.Harvey had been linked with a move to Collingwood but coach Nathan Buckley categorically denied that was the case during grand final week.The Magpies will also be a club to watch, with Dockers forward Chris Mayne and Kangaroos veteran Daniel Wells reportedly targeted.Travis Cloke is contracted for next season but has been strongly linked to the Bulldogs after announcing his desire to start afresh elsewhere. 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