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The Queenstown doubles specialist, alongside partner Jan Lennard-Struff, will face the tournament No1 seeds Marcelo Melo and Lukasz Kubot in the first round tomorrow.
The duos met last weekend, when Melo and Kubot won 6-4 6-4.
However, McLachlan and Struff beat them in last year's Australia Open quarterfinal.
McLachlan has had three grand slam first-round exits since making the Wimbledon quarterfinals last year.
However, he has had a good run of form since the French Open.
After winning the Surbiton Trophy, he teamed with Struff to reach the semifinals at the Halle Open. Last week he reached the quarterfinals of the Eastbourne Invitational.