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.
World No. 410 provisionally suspended by anti-corruption hearing officer.
