NEW YORK — Jessica Pegula might just be the busiest woman at the US Open.
Need proof? Just look no further than her past few days.
On Friday night, she and her mixed doubles partner Austin Krajicek won their opening round match on Court 11 over Laura Siegemund and Sander Gille. On Saturday afternoon, she defeated Elina Svitolina 6-4, 4-6, 6-2, at Arthur Ashe Stadium to advance to the fourth round in singles — and just hours later was back on…