With Victoria Azarenka ailing and Na Li winning her second major title in January, this is the match to see on the WTA Tour. Na Li has a strong serve and great shot making abilities. She has weapons. This does not assure her of victory versus Serena. It does not even make her a favorite as she is clearly the underdog. However, Na Li has a chance versus Serena and in 2013 that was a rarity on the WTA Tour.
Serena has seemed less invincible in 2014 to this point. Serena can reassert herself with a win in Miami. Serena loves and is loved by Miami. Serena does not need this win to still be the dominant force on tour, but she does not want to give Na Li any reasons to believe either.
My prediction: Serena in the long-run should win this match. I think Na Li will push Serena in the first set and perhaps win the first set, but Serena will win the match. Serena Williams d. Na Li 7-6, 6-2