PARIS: Former world number one Novak Djokovic said on Thursday Radek Stepanek was joining his coaching team to complement Andre Agassi. Agassi and former doubles specialist Stepanek will replace the Serb's former coaching duo of Boris Becker and Marian Vajda. He parted company with Becker last year and ended a seven-year association with Vajda in May after seven years working together.