Top-seeded Novak Djokovic defaulted from his fourth-round match at the US Open against Pablo Carreno Busta after a tennis ball he hit in anger struck a line judge in the neck on Sunday.

#Djokovic #USOpen #Tennis
✔️Subscribe to ESPN+ https://plus.espn.com/
✔️ Get the ESPN App: http://www.espn.com/espn/apps/espn
✔️Subscribe to ESPN on YouTube: http://es.pn/SUBSCRIBEtoYOUTUBE
✔️ Subscribe to NBA on ESPN on YouTube: http://bit.ly/SUBSCRIBEtoNBAonESPN
✔️ Watch ESPN on YouTube TV: http://es.pn/YouTubeTV

ESPN on Social Media:
► Follow on Twitter: http://www.twitter.com/espn
► Like on Facebook: http://www.facebook.com/espn
► Follow on Instagram: http://www.instagram.com/espn

Visit ESPN on YouTube to get up-to-the-minute sports news coverage, scores, highlights and commentary for NFL, NHL, MLB, NBA, College Football, NCAA Basketball, soccer and more.

More on ESPN.com: https://www.espn.com