Julian Arredondo won stage six of the Tour de San Luis as his compatriot Nairo Quintana retained the overall lead.
Trek rider Arredondo narrowly held off the challenge of home hope Sergio Godoy at the end of a 166km stage between Las Chacras and Mirador del Sol en Merlo in Argentina.
The Colombian's effort took him from seventh to fourth in the general classification standings, still almost three minutes behind Quintana.
The leader finished five seconds back in third on Saturday and is 35 seconds clear of his nearest challenger, Garmin-Sharp's Philip Gaimon.
Stage six result
1 Julian Arredondo (Col) Trek, 4:16:54
2 Sergio Godoy (Arg) San Luis Somos Todos, +1sec
3 Nairo Quintana (Col) Movistar, +5
4 Cleberson Weber (Bra) Clube Dataro de Ciclismo-Bottecchia, +9
5 Jose Serpa Perez (Col) Lampre-Merida, +10
6 Domenico Pozzovivo (Ita) AG2R La Mondiale, +12
7 Thomas Danielson (USA) Garmin-Sharp, +14
8 Philip Gaimon (USA) Garmin-Sharp, "
9 Adam Yates (Gbr) Orica GreenEDGE, +30
10 Eduardo Sepulveda (Arg) Bretagne-Seche Environement, +30
1 Nairo Quintana (Col) Movistar, 21:35:13
2 Phillip Gaimon (USA) Garmin-Sharp, +35
3 Sergio Godoy (Arg) San Luis Todos Somos, +1:57
4 Julian Arredondo (Col) Trek, +2:54
5 Enzo Moyano (Arg) San Luis Somos Todos, +2:59
6 Eduardo Sepulveda (Arg) Bretagne-Seche Environement, +3:38
7 Peter Stetina (USA) BMC, +3:46
8 Marc de Maar (Ned) UnitedHealthcare, +3:51
9 Darwin Atapuma (Col) BMC, +3:52
10 Domenico Pozzovivo (Ita) AG2R La Mondiale, +4:03