Judging from the stats, Myskina wasn't getting many first serves in, and the ones she was getting in weren't very good. Low first service percentages are a big no-no in general, but especially with a 70 MPH second serve against one of the best returners in the game. It's pretty hard to beat everyone when you win 3 out of 9 service games. Kim controlled the tempo (as she should) but made a few too many errors in the 2nd set. If Myskina held her serve at 4-4, that match could have gone either way. She'll need to step it up against Serena, but I'm confident she will.