Olympic champion Andy Murray survived a major scare against Italys Fabio Fognini to reach the quarterfinals in Rio.The 2012 gold medallist had cruised through his opening two matches and another easy win looked on the cards when he led by a set and a break.But the momentum turned abruptly and Fognini, one of the most talented but unpredictable players on tour, seized his chance.The world No.40 won eight games in a row to lead 3-0 in the decider before Murray, as he so often does, fought back from the brink to claim a 6-1, 2-6, 6-3 victory.In the last eight he will take on American Steve Johnson, who defeated Russias Evgeny Donskoy.Fognini was the last man to beat Murray in Davis Cup, when Britain lost to Italy in the quarterfinals two years ago, but facing the 29-year-old on a clay court in Naples was a rather different proposition to a slow hard court on a windy Rio day.Given what transpired, it was hard to believe how poorly Fognini played in the opening set, with a smattering of boos for the Italians lacklustre performance.He at least roused himself to save three set points and avoid a bagel but Murray was on cruise control. When the Scot broke to lead 2-1 in the second set, he seemed on his way to the quarterfinals with the minimum of fuss, but Fognini found his form and Murray began to make errors.Five straight games from the Italian brought him level at one set all and left Murray needing to fight hard to keep his medal hopes alive.Fognini was on the front foot and having a lot of success at the net, and he maintained his form at the start of the third set with a break for 2-0.Murray had two chances to hit back but could not take them and, had Fognini converted a chance to lead 4-1, the outcome might have been different.But Murray broke back and the wheels fell off for Fognini as the world No.2 reeled off six games in a row.Murray joined Rafael Nadal and Juan Martin Del Potro, who are on course for a semifinal meeting, in the last eight.However, it wasnt all success for Team GBs tennis stars.In the womens tournament Johanna Konta was knocked out at the quarterfinal stage, losing to Germanys Angelique Kerber 6-1, 6-2. 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Several prominent retired and current Olympic athletes have thrown their support behind an international crowdfunding campaign to benefit Russian doping whistleblowers Vitaly and Yuliya Stepanov, who had to flee their home country and settle in an undisclosed location in the United States last year.The public effort, designed to help the Russian couple with educational and living expenses, comes at a time when athletes around the world are urging anti-doping and Olympic officials to ensure whistleblowers personal safety and ability to provide authorities with information.Lauryn Williams of the United States, one of only five athletes in history to have won medals in both the Summer (track and field) and Winter (bobsled) Games, is among those who recorded statements of support on a Swiss-based website.I think that globally, we should make an effort to support them so that other whistleblowers know were serious about stamping out doping, said the 32-year-old Williams, who sits on the World Anti-Doping Agency Athlete Committee.Others publicly endorsing the campaign include Olympic discus gold medalist Robert Harting of Germany, who will defend his title in Rio de Janeiro next month; Olympic cross-country skiing champion Beckie Scott of Canada, who also chairs the WADA Athlete Committee; and three-time Olympic skeleton racer Ben Sandford of New Zealand.Joseph de Pencier, CEO of the Institute of National Anti-Doping Organizations -- a trade and advocacy association for 59 such agencies -- praised the effort.ddddddddddddEqually important are continuing efforts to make use of the Stepanovs experience and insight to improve anti-doping, he told ESPN. We all need to learn from those who report wrongdoing how better to encourage others to come forward.Vitaly Stepanov, a former employee of the now-discredited Russian Anti-Doping Agency, began providing inside information to WADA in 2010. His wife, an 800-meter runner who doped as part of the national system, joined him after being sanctioned in 2013. Her covert recordings later became part of a German television documentary that forced WADA to investigate their allegations.WADAs findings, combined with further, detailed revelations by ex-Moscow lab director Grigory Rodchenkov, have led the International Olympic Committee to consider excluding Russian athletes from the Rio Games next month. Yuliya Stepanova has been granted a special exemption by world track and field officials to compete in Rio, but it is still unclear whether she would be able to do so under a neutral flag if other Russian athletes are excluded. She entered the 800-meter event at the European Championships earlier this month but was injured in her first race. ' ' '