I'm excited for tonight. Serena begins at 1AM in my timezone and I'm thinking of actually watching both matches live, wish me luck

But both semifinals are just SO exciting, I think Serena got this, I was pretty impressed by what I've seen from her vs Halep. She really played like her 2012-2013 at times, much better than her average level of 2014-2016.
Kerber vs Woz will be a long big physical rally filled match, it's going to be great. Somehow, I think Woz will have the edge mentally, she has a much bigger history at the USO than Kerber, plus Wozniacki has basically nothing to lose.
Serena vs Wozniacki for the final !
