A Welsh Guards captain is in fourth place going into the most challenging day of what's said to be the toughest race on earth.
The Marathon des Sables is a week-long ultra-marathon in the Sahara Desert. It consists of six stages, covering over 250km in temperatures rising to 50⁰C.
Tom Evans knows Wednesday's stage is his best chance to catch up with the Moroccans in the top three positions.
Click below to listen to Tom's interview with Forces News. He spoke to us after completing the 3rd day of the race...
To train, Mr Evans ran from 90 to 120 miles per week, mainly on trails, grass or cross country.
He is raising money for Walking with the Wounded and the Welsh Guards Charity, to support the welfare of servicemen and veterans.
Other participants in the marathon include wounded veteran Duncan Slater, who is returning to the race for the second time.
Runners can be tracked live on the Marathon des Sables website.
Cover picture courtesy of Alexis Berg/MDS 2017