Novak Djokovic waits to see how long wrist injury will sideline him

''It happened in two days. Obviously I practiced a lot. Maybe I started a bit too strong,'' he said. ''The transition from hard court to clay, different

''It happened in two days. Obviously I practiced a lot. Maybe I started a bit too strong,'' he said. ''The transition from hard court to clay, different balls, have probably taken its toll.''