Sam Wreford is the form runner in the New Zealand marathon scene.
The Timaru 30-year-old, who won last year's Christchurch Airport Marathon in 2:17.30 and followed up with a 2:16.35 in Invercargill last November, more recently won the Rotorua Marathon for an impressive three titles from three starts.
Wreford returns to the Christchurch Marathon as the favourite, but will face tough competition from veterans Dale Warrander and Phil Costley, who are multiple winners in the Garden City.
Warrander has won the half marathon three times, in 2004, 2006 and 2011, and Costley has won the half marathon once - in 2001 in a then-record 1:02.41 - and the full marathon twice, in 1999 and 2004.
Their best marathon times are also significantly faster than Wreford's - Costley at 2:13.36 and Warrander at 2:12.58 - and between them they have won almost 50 national titles.