Juan Martín del Potro Warms Up Before His SF Match at the 2018 US Open

2009 US Open Champion Juan Martín del Potro warms up before his SF match against World No. 1 and defending champion Rafael Nadal. Visit us at the #USOpen, from now until Sept. 9. http://www.usopen.org Watch Live: http://ms.spr.ly/Watch-ESPN-US-Open-2018 Watch Video: http://ms.spr.ly/2018-US-Open-Watch-V... Photos: http://ms.spr.ly/2018-US-Open-Photos Live Scores: http://ms.spr.ly/2018-US-Open-Live-Sc... International TV Schedule: http://ms.spr.ly/2018-US-Open-Interna... SUBSCRIBE to The US Open Tennis YouTube Channel: http://ms.spr.ly/YoutubeSubscribeUSOpen ✓ LIKE US Open on Facebook: http://ms.spr.ly/LikeUSOpen ✓ JOIN the US Open Conversation on Twitter: http://ms.spr.ly/FollowUSOpen ✓ FOLLOW US Open on Instagram: http://ms.spr.ly/FollowUSOpenIG ✓ ADD US Open on Snapchat: ‘usopentennis’ DOWNLOAD the US Open App: http://ms.spr.ly/USOpenApp For news, ATP and WTA player interviews, match highlights and more, go to our official website at: http://ms.spr.ly/USOpen