Millman commenced 2018 with a wildcard into the 2018 Brisbane International. He defeated Peter Polansky in round one and had two match points against world number 3 Grigor Dimitrov before losing in three sets. Millman reached the second round of the 2018 Sydney International and Australian Open. In February, Millman won the Kyoto Challenger, the tenth of his career, propelling him back into the world's top 100 after a 12-month absence.
