McLachlan, ranked 31 in doubles, fell in the first round of the
men's doubles as he and Jan-Lennard Struff lost 6-3, 6-3 to Frenchmen Jeremy Chardy and Fabrice Martin.
In the mixed doubles, he and fellow Japanese player Eri Hozumo lost 6-1, 3-6, 10-6 to Neal Skupski, of United Kingdom and Maria Jose Martinez-Sanchez, of Spain.
McLachlan changed his allegiance to Japan in June, 2017.