Upsets down under: Unseeded underdogs deliver unexpected results at Aussie Open

MELBOURNE – They come in all shapes and sizes and contexts. They come at different times and in different rounds. Sometimes they’re predictable, or at least there are advanced signifiers of their arrival. Other times, they come unexpectedly.

Nothing causes a tournament to convulse, quite like an upset.

The anatomy of an upset: the underdog shows bark to match bite and meets the moment. The favorite falls out of favor, defeated—and sometimes self-defeated.

So far, the tournament has provided triple tremors. And we still have a week to go. Three underdogs, unseeded, yes, but also unintimidated.

The men’s defending champ, going for a record seventh title, was sent off in five sets. Novak Djokovic…