The U.S. Open has built a retractable, $150 million roof at Arthur Ashe Stadium, after coping for years with rain delays. The two-panel ceiling opens in the morning and closes at night—unless it starts to rain. Photo: USTA Subscribe to the WSJ channel here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Follow WSJ on Facebook: / wsjvideo Follow WSJ on Google+: https://plus.google.com/+wsj/posts Follow WSJ on Twitter: / wsjvideo Follow WSJ on Instagram: / wsj Follow WSJ on Pinterest: / wsj Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: / videos On Twitter: / wsj On Snapchat: https://on.wsj.com/2ratjSM