Jack Sock beats Marin Cilic in three sets at ATP World Tour Finals – live!

Tie-break: Cilic 4-7 Sock* (*denotes server): Cilic sends a backhand long and Jack Sock has his first ever win at the ATP World Tour Finals!

Tie-break: Cilic 4-6 Sock* (*denotes server): Sock pings a backhand down the line and Cilic, stretching desperately, deflects a forehand wide! Sock has two match points.

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For more details, click on: Jack Sock beats Marin Cilic in three sets at ATP World Tour Finals – live!