Novak Djokovic is bringing aboard former top-10 player Radek Stepanek as a coach.
The new alliance was announced via Instagram Live, Djokovic taking questions from fans before speaking to Stepanek.
"The fact that he just recently retired speaks volumes of his love for the game".
"I am excited to join our forces and can not wait to compete again having a new team to back me up".
A quarter-final appearance at Wimbledon in 2006 was Stepanek's best singles performance in a Grand Slam, but in the latter years of his career Stepanek excelled in doubles, winning the US Open, Australian Open and Davis Cup (twice). The Serb has not played competitively since.