MELBOURNE, Australia — Gabriel Diallo of Montreal battled for more than four hours, but his conditioning paid off as he outlasted Luca Nardi in a five-set men’s singles marathon to advance to the second round of the Australian Open on Monday. The 23-year-old Canadian prevailed 6-7 (1), 7-6 (3), 5-7, 6-1, 6-2 over the 21-year-old […]