FLUSHING, New York (Ticker) - American James Blake has an underdog quality that has endeared him to U.S. Open fans. They will have an opportunity to cheer him on at least one more round. Blake produced arguably the biggest win of his career Saturday, stunning second-seeded Spaniard Rafael Nadal, 6-4, 4-6, 6-3, 6-1, in the third round at Arthur Ashe Stadium. The 25-year-old Blake had missed much of last year with a broken neck, a lengthy illness and the death of his father from cancer, but he began to gain attention when he won last weekend's Pilot Pen tournament in...