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By Steve Dorsey  DELRAY BEACH, Fla. – Jack Sock’s bid to defend his title here came to a screeching halt Wednesday night when the top-ranked American on the ATP World Tour exited the Delray Beach Open when he dropped a three-setter to fellow American Reilly Opelka. Opelka’s 4-6, 7-5, 6-3 second-round upset was the most stunning of Day 3 that also saw No. 6 seed John Isner and ninth-seeded Milos Raonic exit on a sun-splashed but windy day at the Delray Beach Stadium and Tennis Center. Sock, ranked No. 8 in the world, was the No. 1 seed here and he joins a long list of No. 1 seeds to fall short of winning the Delray Beach title. The only No. 1 seed to run the table in Delray was Mardy Fish in 2009. The 6-foot-11 Opelka arrived in Delray Beach with a world ranking of No. 228, but...