Former world #23, multiple titlist and GS QFist in singles, GS winner in doubles. I seriously doubt salty scrub Swan will ever get anywhere close to any of these feats in her career.
So I was right, she's done nothing in the game
this is one of the weakest defences I've ever heard.
1 Quarter final in a slam from 27 attempts and 17 Round 1 exits.
Highest Rank 23 is not exactly boasting territory.
Nobody gives a monkeys about doubles tennis unless your a hardcore with too much time on your hands.
She only won 2 tournaments on tour, 2 lowly internationals in China against mostly weak opposition.
Nothing against her but that's just a completely ordinary career, I don't think Swan is all that either and doesn't seem to have a mental edge about her to compete at the top level, but matching what Zheng has done is hardly a tall order.
Back to the original point, she needs to talk to people face to face if she has something to say, it's embarassing and classless to start bullying a 20 year old on twitter.