The 30-year-old world No. 8 will fly back to Europe for tests.
Top seed tops Tomic to extend winning streak to 21 matches.
The 2014 U.S. Open has the serve and is looking to add to his arsenal with new coach Jonas Bjorkman.
"She's been phenomenal to the sport of tennis," Hall of Famer says of Serena.
Nadal says all the tennis from Rio finally took its toll on his body.
Keep tabs on all the haps on a busy quarterfinal Friday at the Western and Southern Masters in Cincinnati in the Tennis Now Live Blog
Both U.S. Presidential candidates are New York residents with ties to tennis.
