Stars rolling the dice with celebrity coaches

On one hand there's Ivan Lendl, whose sage advice has helped Andy Murray win two Grand Slam titles and the admiration of the British public.

On the other there's Jimmy Connors, whose ill-fated association with Maria Sharapova lasted just one match before they went their separate ways.

With today's players increasingly turning to yesterday's stars as coaches, which celebrity partnerships will live long in the memory and which will be best forgotten?