The former world No 2 will guide fellow Pole Magda Linette as assistant coach and consultant
The American beat Magdalena Frech to become the youngest player to reach the quarter-finals of the Australian Open since Radwanksa in 2008
The physical and mental effort of reaching and then doing well at the season-ending events can take their toll the following year
Several players, including Wawrinka, Bublik, Dimitrov and Flipkens are among the playing captains at the United Cup
