Kerber defeated Petra Martic 6-3,7-5 in the fourth round of French Open
to reach the quarter finals meanwhile Sara Errani out lasted the 2009
champion Svetlana Kuznetsova 6-0,7-5.
Errani now has beaten two former French Open champions in a row; Errani
beat Ana Ivanovic in three sets in the previous round. Both Kerber and
Errani had never reached the last eight of Roland Garros before