The UCI confirmed that Vuelta a San Juan winner Gonzalo Najar failed an anti-doping test in January at the Argentinian race.
Few thought Gonzalo Najar could win the Vuelta a San Juan, but he climbed away from some of the world's top riders.
Giacomo Nizzolo won the final stage of the 2018 Vuelta a San Juan on Sunday in the host city, as Gonzalo Najar captured the overall title.
Ryan Mullen joined Trek-Segafredo over the offseason and captured the team's first victory of 2018 when he won the Vuelta a San TT.
Argentinian cycling fans cheered one of their own, Gonzalo Najar, to victory and the overall lead at Vuelta a San Juan
Fernando Gaviria crashes in Argentina, putting his classics ambitions in jeopardy. He did not suffer any fractures.
Ryan Mullen wins stage 3 and Filippo Ganna takes the overall lead after Vuelta a San Juan time trial.
Roman Villalobos attacked his way to the overall lead Monday in stage 2 of Vuelta a San Juan.