Rising American youngster Christina McHae has pulled out of next week's WTA Toray Pan Pacific event in Tokyo.
McHale is still suffering from the effects of a virus she caught while contesting the London Olympics in July.
The 20-year-old lost in the first round of the US Open to Kiki Bertens and said she felt weak in the third set of that match.
“I am still not feeling 100%,” the 29th-ranked McHale tweeted.
McHale is one of the rising young Americans on the tour
How to play from the baseline
The expression “to endure the rally” is about those indeterminate moments of a rally where none of the players is leading.
The ability to endure the rally is fundamental when you play a “long rally”, because it offers you the chance to measure your opponent’s strong points and vulnerabilities, besides letting you position as best as possible for your next offensive shot.