Here are my predictions for the women's semifinals at the 2018 Australian Open. Last year I did not predict the quarterfinals but correctly predicted 1 of 2 men's semifinals and 2 of 2 women's semifinals. This year I predicted correctly 3 of 4 women's quarterfinals and 2 of 4 men's quarterfinals. I have also predicted the men's semifinals.
Simona Halep (ROU)  vs. Angelique Kerber  (GER). Halep has already played the match of the tournament by surviving a 3 hours 44 minute tussle with American Lauren Davis in the third round, while Kerber is looking like she has been able to capture the form that allowed her to beat Serena Williams in the final here two years ago. They both got here by dispatching two tall, hard-hitting opponents. Halep went down 0-3 (and breakpoint) against Karolina Pliskova in the quarterfinal but then won 12 of the next 14 games to sweep the Czech player 6-3 6-2. Halep was even more dominant against 2017 US Open finalist Madison Keys with a 6-1 6-2 win. These two have a head-to-head tied at 4-all but they did not meet at all in 2017 where Halep had her #1 ranking performance. They met 5 times in 2016 when Kerber was winning 2 majors and ended the year #1 and Kerber won 4 of those matches. This will almost certainly not be a straight sets sweep by one player; if it is not a 3-set, 3-hour war of attrition of shotmaking and indefatigable ball retrieving many will be quite disappointed. I think this is basically a tossup but I think I will go with Halep because I think the fact that she is ranked World #1 now and has already saved match point(s) in this tournament will give her the confidence to persevere even when things get tight and grim. PREDICTION: Halep.
Caroline Wozniacki (DEN)  vs. Elise Mertens (BEL)