Actually, the asian woman has very good grounds for assault charges.
Note that Serena took her racquet and shook it in the woman's face
as she said:
I swear to God I’ll fucking take this ball and shove it down your fucking throat! Do you hear me? I swear to God. You better be glad–you better be fucking glad that I’m not, I swear.”
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Assault - an intentional act by one person that creates an apprehension in another of an imminent harmful or offensive contact. An assault is carried out by a threat of bodily harm coupled with an apparent, present ability to cause the harm. It is both a crime and a tort and, therefore, may result in either criminal or civil liability. Generally, the common law definition is the same in criminal and
Tort Law. There is, however, an additional
Criminal Law category of assault consisting of an attempted but unsuccessful
Battery.
The act required for an assault must be overt. Although words alone are insufficient, they might create an assault when coupled with some action that indicates the ability to carry out the threat. A mere threat to harm is not an assault; however, a threat combined with a raised fist might be sufficient if it causes a reasonable apprehension of harm in the victim.
http://legal-dictionary.thefreedictionary.com/Assault
It wouldn't surprise me a bit if the lady sues Serena and gets a large
monetary settlement.