Can she; yes. Will she; no...
Who is capable of beating her seriously ? The most difficult test will be RG as usual.
Who is capable of beating her seriously ? The most difficult test will be RG as usual.
Based on this year, I don't see her as unbeatable.
French: She lost in the 1st round of the French. Her best shot is her serve and it will play 5% slower at Roland Garros. If other players get into the points on fairly even footing, there are several players that can outplay her - Azarenka, Li Na, +++ Serena is an good mover but not great mover on hard courts. But, her movement is below average on clay.
AO: plays fairly slow which negates her serve but fast enough that this is a good surface for her. She has a good shot here and she should still have lots of confidence from USO.
Wimby: Serena's best surface and her most likely GS title next year
USO: Stosur beat her last year and Azarenka came within 2-3 points of beating her this year. Serena looked vulnerable at several points during the match.
I think Serena has a very very small chance of winning calendar year slam.
1. She is 31 YO and older players are prone to minor injury. A mild sprain could make her vulnerable and it is unlikely she can play at peak health for the whole year with her go for broke style.
2. She has a history of going in and out of focus. Contrast her career with Federer's. She has a good year or 2 and then loses focus and then gets re-energized for another year or 2 and then back out of focus. Federer makes the SF round of every GS for 6 years straight or something crazy like that. If she does not maintain her edge which includes playing enough smaller events to remain sharp, her level will drop.