World No 1 Iga Switak and home favourite Coco Gauff sparked in the Big Apple as they both eased through to the third round of the US Open on Wednesday. Swiatek did not look completely at ease as she was made to work for a 6-3 6-4 win over the 322nd-ranked Australian Daria Saville. "I just felt like I kind of prevailed, because that match wasn't easy," said Swiatek, who next meets the player she describes as her best friend on the WTA Tour Slovenian qualifier Kaja Juvan. "I'm just happy to be in the third round. "For sure I…