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Defending champion Novak Djokovic and fellow two-time winner Rafael Nadal were drawn for a potential US Open semi-final clash on Friday. Djokovic, the top seed who has been nursing a wrist injury since a shock first round loss at the Olympics, begins his campaign against big-serving Jerzy Janowicz of Poland. Janowicz, a Wimbledon semi-finalist in 2013, has been plagued by knee trouble in recent months and has seen his ranking slump to 228 in the world.
The agency's move to expand its previous guideline for blood screening comes after Florida officials on Tuesday announced the first case of Zika transmitted by mosquitoes in Pinellas County near Miami, where the first locally transmitted U.S. cases were reported. The FDA last month ordered blood banks in Florida's two most densely populated counties - Miami-Dade County and Broward County - to stop collecting blood. The FDA also recommended that nearby counties implement the same measures.