Federer looking for new coach after slipping to seventh

Former world number one Roger Federer has split with coach Paul Annacone after three and a half years.

The Swiss has slipped to seventh in the world - his lowest ranking for over a decade - and saw his hopes of reaching next month's end-of-season ATP World Tour Finals in London dented on Thursday by his third-round exit from the Shanghai Masters at the hands of Gael Monfils.