How could they choose Halep/Rogers over Kerber/Azarenka is beyond me
@michael made a good point, Labor Day weekend always has the best matches in the day. More because of TV reasons (the later matches will be competing with the marquee college football games in the US).
One match at a time, Serena might not get past Keys/Venus
or Bouchard
If she gets past Keys (who imo is a girl she should never lose to as long as she runs at about 90% of her current speed) she is not losing before the finals.