I think that's a good bet.
Either Kanepi is going to get pasted or takes a set from Serena.
However the possibility of 6-3 6-3 is there as seen in Serena's last match, my guess is that she may want to ensure just a victory and avoid injury.
Noticed that from Serena in the past GS, ease through the first 3 rounds and then just make sure her game is ok thus getting large points here is worth it.
Continued success!