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LONDON—It doesn’t happen as often as it used to, but the Big Four of men’s tennis is safely into the second week of a Grand Slam tournament. Roger Federer, Novak Djokovic, Rafa Nadal and Andy Murray, the top four seeds here, all cruised through the first three rounds of Wimbledon to raise the prospect of the first all-Big Four semifinals since 2012.
For fans in southwest London, however, the success of their favorite players—and the…