I watched part of the match, fantastic match it was especially the 3rd and deciding set.
Serena was leading 3-0 but Sabine fought back to win the set 6-4, matching Serena both with power and superb shots including serves and returns of serves.
If Sabine can get some consistency going, she is definitely going to be a top 5 player.
Power, good serve, good groundstrokes, willing to take risks and always smiling cheerful too.
Imo, she is a much better player than those ranked and seeded higher than her like Li Na, Kirilenko, Kerber, Radwanska, etc.