One of Novak Djokovic's ex-allies believes hiring Andy Murray as coach could prove the catalyst to the Serb winning a record 25th grand slam singles title.

The tennis icon joins a star-studded lineup on the BNP Paribas Open entry list. The event starts March 2 in Indian Wells.

Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an Australian Open semifinal.

But Australian coach and strategist Craig O’Shannessy, who helped Djokovic claim four grand slam titles between 2017 and 2019 ...