Serena wasn't flawless, but she was very good. The Insider Team recaps Day 4 at the US Open, which featured a roof sighting, and Beyonce sighting, and dominant Serena sighting. Hear from the World No.1 after her second round win as well as No.51 Zhang Shuai, who remains one of the most heartwarming stories of the 2016 season. Subscribe to the podcast on iTunes, Stitcher, TuneIn or on any podcast app of your choice to ensure you never miss an episode when they go live. Reviews are always helpful, so if you like what you've heard so far, leave us one. You can also get new episode alerts by following us on Twitter @WTA_Insider.