In the buildup to the 2016 Summer Paralympics in Rio, Santos attended the 2015 IPC Athletics World Championships in Doha. There he took gold in the 1500m – T11, but the events of the 5000m – T11 final saw Santos dramatically lose a commanding lead on the last lap. In the closing stages of the race with Santos clear of the rest of the field he fell to the floor with exhaustion, on returning to his feet he was overtaken by Chile's Cristian Valenzuela. Despite the support of his guide, Santos collapsed a second time, and was passed by Jason Dunkerley of Canada. Santos rose again only to collapse meters from the line to lose the bronze medal place to Japan's Shinya Wada.