Boris Becker warns Novak Djokovic to refocus

Becker also explained how Djokovic lost motivation after winning last year’s French Open, which was his first triumph at Roland Garros and meant he held all four grand slam titles.
Since then, the 29-year-old has endured early exits at Wimbledon and the Olympics before crashing out in the Australian Open second round to wildcard Denis Istomin last week.