The Slovenian, whose previous victories came between 2019 and 2021, has now joined Spanish rider Roberto Heras, the winner in 2000 and 2003-2005, for the most wins.
It is the fourth stage win for the Spanish riders in the Vuelta this year, with Pablo Castrillo securing two of them.
The 141.5km 17th stage proves to be a historic day for Australian cycling, with three riders leading three different standings as Groves leading the charge in superb fashion.
Primož Roglič cuts the Australian rider's lead to just 5 seconds in a stage won by Marc Soler. Wout van Aert crashes out of the race.
Ben O'Connor loses more ground to three-time Vuelta winner Primož Roglič despite a 20-second penalty for sheltering behind a team car.
Australian Ben O’Connor maintains the overall lead despite Slovenian Primoz Roglic’s advance.
Michael Woods soars to Vuelta stage 13 victory after the brutal summit finish at Puerto de Ancares, while Primoz Roglic opens significant gaps on his GC rivals.
The Spanish rider secures a Vuelta stage win for Kern Pharma, just hours after the team announced the passing of its founder and former president.
The Irishman overcomes recent injuries and near retirement to win his first Grand Tour stage, while Primoz Roglic cut time off Ben O'Connor's overall lead at La Vuelta.
The Belgian rider from team Visma-Lease a Bike dominates a mountainous route in Galicia to another top podium finish. Ben O'Connor retains the overall lead for a fifth day.