Jim Courier said Novak Djokovic's decision to work with so-called 'guru' Pepe Imaz was partly to blame for his shock defeat at Roland Garros on Wednesday.
Andre Agassi and world number four Novak Djokovic need to work together for at least a month if the American's coaching is to have a long-term impact on the struggling Serb's game, three-times Wimbledon champion John McEnroe said.