It's not really a serve problem, it's a head problem - which might be actually even worse. She was playing doubles about an hour after her singles match and she was serving way better. I mean she is never going to win a lot of points on her serve outright - but at least it was a decent offering during the doubles match. When playing singles she _knows_ her serve is bad, she misses a ton of first serves, that makes her tense even more, which causes her to serve even worse, which affects her entire game. During doubles Mattek seems to be a great help for help mental wise, she keeps Iga loose. It also seems Iga is not that used to playing with fans around, and if things do not go well it just snowballs. it's a problem, hard to say what will happen.