Dina Averina won the battle of the Russian identical twins to clinch the all-around title at the International Gymnastics Federation Rhythmic World Championships in Pesaro.
She pushed her sister Arina Averina into second place with an overall score of 74.700 at the Adriatic Arena in the Italian city.
The siblings had dominated the individual events on days one and two of the competition, winning two gold medals apiece.
Dina won the clubs and hoop world title while Arina was successful with the ball and ribbon.
It led to an intriguing showdown between the two for the all-around victory and it was Dina who came out on top after leading throughout.
She scored 18.850 with the hoop, 18.550 with the ball, 18.850 with the clubs and 18.450 with the ribbon in her winning effort.
Arina only sat fourth after the hoop - the first discipline contested - scoring 18.150.
She was able to recover but only enough for the silver medal, with her final total 73.450.
Israel won bronze as Linoy Ashram finished on 70.025.
The twins are 19-years-old with Dina the youngest by 20 minutes.
Their World Championship success comes after they also won all of the gold medals between them at July's World Games in Polish city Wrocław.
The group all-around event will be held tomorrow.