FOURTH ROUND MATCHES
Angelique Kerber (GER)  vs. Maria Sharapova (RUS) . Sharapova leads their head-to-head 4-1 but the two have never met on grass. On paper Sharapova should win this match but for some reason I think Kerber is going to make this one very tough. If it is played indoors under the roof I give a decided edge to the Russian but if it is played in muggy, outdoor conditions I think the German can make things interesting. With Serena Wiliams suddenly out of the tournament Sharapova must realize that she has an amazing opportunity to win another major, and that pressure could complicate things as well. If anyone can put pressure on Sharapova it is Kerber. I am still predicting Sharapova to come through and win this match, but would not be surprised (or displeased) if Kerber did instead. PREDICTION: Sharapova.
Simona Halep (ROU)  vs. Zarina Diyas (KAZ) . I follow both women's and men's tennis pretty closely and I have never even heard of Zarina Diyas before. Halep has had very difficulty getting through her three previous round and should be full of confidence as the highest remaining seed in the tournament for the second consecutive major. Diyas dispatched 2-time major finalists Vera Zvonareva in 3 sets in theround before so she must have some game. But still, expect Halep to continue to play to her seeding heree. PREDICTION: Halep.
Lucie Safarova (CZE)  vs.
Agnieszka Radwanska (POL)  Ekaterina Makarova (RUS) . This should be an insanely tight match, most likely very ugly. The two are even in their head-to-head. They are both leftys and leftys hate playing other leftys. This is the farthest either has ever reached in a major tournament, although both players have delivered major upsets in major tournaments, with Makrova having beaten both Williams sisters in Australia (in different years). Safarova is well-known as a bit of a wild card, while Makarova is considered a strong, solid player who can be dangerous to higher ranked opponents if they are having abad day. Safarova is always dangerous, but if you weather the storm she usually flames out. In this contest, I think slow and steady will win the race. PREDICTION: Makarova.
Petra Kvitova (CZE)  vs.
Caroline Wozniacki (DEN)  Barbara Zahlavova Strycova (CZE) . Kvitova has already played the best match of the tournament so far in her 3rd round win over 5-time Wimbledon champion Venus Williams. The 2011 Wimbledon champion has won 19 of her last 21 matches played at this tournament. Happily for her, she is facing one of her three countrywomen who are in the final eight remaining players in the tournament, a player whom she has only lost to once before in four meetings, and should not have much trouble defeating again,on her best surface. I saw Strycova play close up in person at Indian Wells and she is a very good ballstriker so her upset of Wozniacki was not a surprise to me. But there's a reason why she is in her first major quarterfinal and her opponent has reached five consecutive quarterfinals at this tournament. PREDICTION: Kvitova.