World number 22 Jack Sock beat qualifier Filip Krajinovic to win his first Masters 1000 title in Paris and qualify for the ATP Tour Finals.

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The 25-year-old American came from a set down to beat the Serb, 77th in the world rankings, 5-7 6-4 6-1.

Sock, seeded 16th, is the first American to win the tournament since Andre Agassi in 1999.

Victory meant he took the final place at the season-ending ATP Tour Finals from Spain's Pablo Carreno Busta.