Americans to travel to Uzbekistan for Sept. 18-20 World Group playoffs.
German tennis star now being helped by Novak Djokovic's coach.
Former No. 1 is top seed at this week's Istanbul Cup.
Serena Williams became the oldest No. 1 in WTA history in February of 2013. Two years later, she's still top dog.
Maria Sharapova, Serena Williams, Donna Vekic, Kristina Mladenovic and Monica Puig enjoyed R & R at the beach.
World No. 10 set for Hamburg return next week, seven years after he beat Roger Federer to win the title.
"I really felt when I had her as my captain, I never had a doubt I would win the match," Bartoli says of Mauresmo.
