It really hasn't been a good week for the seeds! But I guess it's not too surprising in the first week of the season - ideal time for lower-ranked players to score upset wins.
There also seem to be quite a lot of injuries so early in the season. Awful day yesterday in Brisbane WTA singles tournament with only Azarenka's match completed. Sharapova and Voegele got walkovers, Kerber's opponent retired.
In Chennai today Fognini has retired, Pospy has a walkover. Also 2 retirements yesterday.