Day One in Chicago brought excitement and intensity as Team Europe gained an early edge.
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The Serb won his second major of the season, defeating Juan Martin del Potro in straight sets.
The 20-year-old wins her maiden grand slam title despite controversy
The 2009 Champion will look to win his second major title on Sunday against Novak Djokovic.
Williams defeated Sevastova in straight sets. Will face Osaka for title.
The two-time US Open champion will face Kei Nishikori next.
The twenty-three time major champion takes a step closer to another US Open title
In a battle of 20-year-olds, Osaka advanced 6-3, 2-6, 6-4.
The defending-champion advanced after a 6-3, 6-3 win.
The Croat is looking to duplicate his 2014 championship run



