The two star attractions will not play due to economic uncertainties
Kiki Bertens has a little trouble with the IPTL rules during a December 3 match in Japan.
Hall of Famer, who led France to 1997 Fed Cup championship, returns as captain in 2017.
World No. 1 stars in two new ad campaigns.
"Kyrgios has unbelievable potential," says King of Clay.
World No. 8 puts speed gun to test.
Two-time Wimbledon champion hopes to recover in time for Hopman Cup.