Serena v Azarenka – quarter-final stats that matter

Question

Serena Williams smacked 57 winners to just 22 from Victoria Azarenka as the American staged a come-from-behind win in her Australian Open 2010 quarterfinal. But Williams’ 38 unforced errors, compared to Azarenka’s 24 might have been part of the reason why the top seed found herself a set and 0-4 down in the second in the first place.