Serena Williams v Li Na – head-to-head record

Question

Serena Williams leads her Australian Open 2010 semi-final opponent 3-1 in their previous head-to-head record. They first played one-another in the first round of the 2006 Australian Open, where Serena won in three sets. Li took her only victory so far against Williams at Stuttgart in 2008 but has pushed the American to three sets in three out of their four previous matches.