It is always a gamble buying tickets for San Francisco Ballet. I try to guess which performances my favorite dancers will dance, but I am doing this guessing when I am ordering the tickets months in advance of the performances. Cast lists for upcoming performance dates are only posted on the San Francisco Ballet website a few days in advance of performances, so I just found out today who will dance in the performance I will see on Sunday of the new production of Swan Lake. Yuan Yuan Tan, my favorite, will dance the Swan. This is the best news the weekend could possibly offer.