Coria joined last year's runner-up Rainer Schuettler among the early big-name casualties at the season-opening grand slam after struggling with injuries.
The Argentine pulled out of last week's Auckland Open with an abdominal strain but was later cleared to play in Melbourne.
Saulnier, ranked 76th in the world, has never been past the second round of a grand slam in his professional career. He plays Morocco's Hicham Arazi in the second round on Thursday.
