Cameron Spencer NIKON-WALKLEY SPORT PHOTOGRAPHY FINALIST ‘Spencer knows a thing or two about defining moments. If you saw one image from the Rio Olympics, it was probably his shot of a grinning Usain Bolt leading a pack of sprinters. In this body of work Spencer also seeks out such moments in football, tennis and on the waves.’ ‘The defining moment is the split second when something magical happens in sport, when a game hinges on a play, or a race is remembered by a moment that fleets in a millisecond,’ Spencer says. Here’s a shot of Jason Finlay at the 2016 Shark Island Challenge.

Photograph: Cameron Spencer/The Walkley Foundation