What makes for a good ending? Of a work of art; of a career; of a life? And does the ending matter, if what's happened before it has been a grand success?

Geoff Dyer has written about photography, jazz, travel, cinema, service and anything else that captures his attention, and taken home a bushel of prizes along the way.

And in his latest work, The Last Days of Roger Federer, he's turned his eye to endings.