Britain's Simon Yates pipped twin Adam to victory as the brothers claimed a one-two finish on stage five of the Tour de l'Avenir in France.
Both siblings were among four riders who surged clear of the field over the summit of the day's final climb and subsequent descent to the finish line in Morzine.
The quartet was later whittled down to three and it was 21-year-old Simon - winner of the gold medal in the points race at the Track Cycling World Championships in Febraury - who emerged victorious ahead of Adam and France's Alexis Gougeard.
The victory was Simon's second at the race following his win on stage seven of the 2011 edition.
The Tour de l'Avenir is for riders aged 23 or under and is regarded as one of the premier proving grounds for stars of the future. Nairo Quintana, runner-up at this year's Tour de France, is among its former winners.
Adam now sits second in the general classification, 1min 03sec behind leader Ruben Fernandez, of Spain. Simon is in 24th, 4min 27sec back.