Eurosport - Sun, 02 May 19:37:00 2010
The Spanish Loule-Louletano rider put in an astonishing final day showing on the 198.9km concluding stage from Fuentes Del Narcea to Oviedo, finishing a full one minute 36 seconds ahead of Ezequiel Mosquera (Xacobeo Galicia).
Pasquale Muto (Miche) finished third in the stage, a further 46 seconds back.
Zaballa's performance left him almost a minute clear of Colombian rider Fabio Duarte in the general classification, though Cafe de Colombia rider Duarte hung on to take second place in the race. Spain's Beñat Intxausti Elorriaga (Euskaltel-Euskadi) finished third.
Key to Zaballa's success was his series of attacks on the final stage's climbs, building the critical lead as Mosquera and Duarte played cat and mouse over the final kilometres.
Fabio Duarte won the fourth stage of the Vuelta a Asturias to leap to the top of the general classification.
The Colombian rider led hope his compatriot and Cafe de Colombia team-mate Alex Norberto Cano by 16 seconds in the mountainous 168.8km stage from Cafes Toscaf to Alto del Acebo.
The pair had attacked together 6km from the summit finish, and built an impressive lead as third placed Benat Intxausti - the overnight leader - finished over a minute behind Duarte.
Duarte leads Intxausti by 19 seconds in the general classification, with Intxausti's fellow Spaniard Santiago Perez (Loule-Louletano) third, some 31 seconds further back.
Spaniard Joaquin Sobrino won the first half of stage three of the Vuelta a Asturias, edging compatriots Javier Moreno and Enrique Mata in a mass sprint.
The 88km morning stage saw a three-man escape group get away early on. But they were caught with two kilometres to go, setting up the sprint finish.
In the afternoon time trial Benat Intxausti Elorriaga recorded the first professional victory of his career, stopping the clock at 17 minutes and six seconds, to take the overall lead by four seconds.
Intxausti's Euskaltel team-mate Jonathan Castroviejo tooks second, while previous GC leader Angel Vicioso finished third, 19 seconds back.
Angel Vicioso Arcos (Andalucia-Cajasur) claimed victory on stage two of the Vuelta a Asturias in northern Spain.
The Spaniard finished Wednesday's first stage in second place but went one better a day later after sprinting over the line ahead of 20 other riders who had broken clear on the category two San Martin de Huerce climb.
Vicioso saw off the challenge of Santiago Perez and Constantino Zaballa, the Loule-Louletano team-mates coming up second and third respectively.
Those three riders now occupy the top three spots in the general classification after overnight leader Pablo Urtasun Perez (Euskaltel-Euskadi) finished over 11 seconds behind Vicioso.
Friday's third stage sees the riders travel from Gijon to Aviles.
Euskaltel-Euskadi's Pablo Urtusan took first blood on the opening stage of the Vuelta a Asturias from Orviedo to Llanes in northern Spain.
The Spaniard was helped to victory by his team-mates who dominated the final five kilometres of the stage.
Urtusan broke late on to race past Angel Vicioso (Andalucia-Cajasur) and Joaquin Sobrino (Seleccion Espana) with the finish line in sight.
Victory saw Urtusan don the overall leader's jersey head of Thursday's ride from Llanes to Gijon.
Tour of Romandie:
Stage 5 - Sunday 5pm on British Eurosport (Sky 410 / Virgin 521) & Eurosport Player