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Not sure how significant that metric is. You almost always have to beat 2 or 3 Top 10 players to win a Masters/Major. The only title Djokovic won this year without two Top Ten victories was Adelaide. He had at least two in every Masters/Major he won this year
It is always true for ATP finals but not quite for slam and masters.
Djokovic won 18 of his slams by beating multiple top 10 players, Nadal and Federer both won 16.