Jack Sock of USA (8) in action during his Group Boris Becker Match against Marin Cilic of Croatia (5) - Sock def Cilic 5-7, 6-2, 7-6<br />
<br />
Photographer Ashley Western/CameraSport<br />
<br />
International Tennis - Nitto ATP World Tour Finals - O2 Arena - London - Day 3  - Tuesday 14th November 2017<br />
<br />
World Copyright ¬© 2017 CameraSport. All rights reserved. 43 Linden Ave. Countesthorpe. Leicester. England. LE8 5PG - Tel: +44 (0) 116 277 4147 - admin@camerasport.com - www.camerasport.com