This is the seventh time Serena has won this title and to be fair she was not playing what I would call her best tennis.
However Serena's serve remained consistent and it never let her down and her serve holding up was key to her retaining her title.
Li Na had a good tournament and I suspect if had been facing a player other than Serena the she probably would have won the title.
Right now Serena is making and breaking records and it is certainly makes it more interesting for me and I am sure it serves as additional motivation for Serena.