Ajla Tomljanović was quick to charm the crowd after ending Serena Williams's career at the US Open. Who is the Australian player?

Australian Ajla Tomljanović knocked Serena Williams out of the US Open in what's likely to be the last match of the US great's career.

So, it could be expected that some spectators were upset with the outcome. 

But Tomljanović was quick to charm the American audience with her humility.