World champion Alistair Brownlee says it will be "a great thing" if he can repeat 2009's victory in the Hyde Park Triathlon, and position himself as a gold medal favourite for London 2012.
Hyde Park Triathlon
live on the BBC.
Elite women's race live on Saturday 1300-1515 BST on Red Button & the BBC Sport website (UK users only).
Elite men's race live on Sunday 1500-1800 on BBC 2, Red Button & the BBC Sport website (UK users only).