In 2010, Nieves set a world record in the T12 10,000 meter race. 40 days later at a race in Jerez de la Frontera, he set a world record in 10,000 meters. He competed in the 2011 Pontevedra half marathon. In 2011, he injured the third metatarsal. His physical therapy after the injury involved training in the pool. He started competing again in late September 2011 at a race in Berlin.