2 of the youngest medal winners from the Winter Olympics are also among the biggest rivals in sport

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Evgenia Medvedeva and Alina Zagitova celebrate their success in South Korea.

Alina Zagitova and Evgenia Medvedeva mesmerised audiences with elite figure skating routines last week.

Medvedeva's brilliance is no surprise - she had been dominating the ice rink for years.

But Zagitova is the new kid on the block.

The teenaged Russians both won medals at the 2018 Winter Olympic games in Pyeongchang.

Their individual successes in South Korea give a clue as to what's in store in the years to come - the start of great rivalry in sport.

Here's what we know so far.