The World No.2 left a heartfelt letter on social media, explaining her recent struggles.
Andy and Jamie Murray won the final eight points to triumph in a competitive battle with Mahut and Roger-Vasselin.
One playoff spot remains with one day of regular season left in World Team Tennis
World No. 1 has new trainer; Goran Ivanisevic will be primary coach in Cincinnati.
Roland Garros champion will decide on Cincinnati after playing Montreal.
The Aussie was at his show-stopping best on Tuesday at the Citi Open.
The Orange Country Breakers kept their playoff hopes alive on Monday, as did the Vegas Rollers.
