Second seed Sharapova opened her campaign on Monday with the same scoreline against fellow Russian Olga Puchkova and completed 92nd-ranked Doi's humiliation in 47 minutes.
Doi, raising ironic cheers from the crowd at Hisense Arena with every point she won late in the contest, surrendered the match by slamming a shot into the net to hand Sharapova a virtual walkover.
Sharapova will next play Venus Williams or Alize Cornet in the third round as she bids for a fifth grand slam and second at Melbourne Park.
(Reporting by Ian Ransom; Editing by Peter Rutherford)
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