Its David vs. Goliath type stuff when Serena is playing. She just overpowers her competition.
Find it hard to believe she is not a serious steroid user though. Had a pulmonary embolism earlier this year which is strongly linked to anabolic steroid use and her on court rage from a couple US open's ago was also a red flag. The Mark McGuire/Sammy Sosa syndrome of the WTA tour I guess, they need Serena so much they probably look the other way.