Paris, France, 24 May 2016 | AAP

Restless nights await Australians Sam Stosur and John Millman following an eventful, rain-affected day at Roland Garros.

On a second consecutive day affected by poor weather at Roland Garros, Millman is locked at one-set all with 15th seed John Isner, while Stosur is up a set in her first round match with Japan’s Misaki Doi before both matches were halted due to poor light.

They will resume on Tuesday morning of a bumper day for Australians at Roland Garros – with Bernard Tomic, Sam Groth, Daria Gavrilova and Arina Rodionova all in action.

Millman’s match is evenly poised at 7-6(4) 6-7(12), though the 26-year-old blew a golden chance to take a two-set advantage into Tuesday, when he failed to capitalise on seven set points in the second set.

Millman served for a two-sets-to-love lead and pushed ahead 5-4 40-0 but couldn’t close. He then led 5-2 in the tiebreak and held another three set points further in.

Yet having stared down the biggest serve in men’s tennis, Millman missed an uncharacteristic error on a regulation smash to concede the second set tiebreak 14-12.

Stosur’s match started in near darkness, but it didn’t hinder her efforts to romp through the first set, though she conceded a second-set break to take a 6-2 1-3 lead into Day 3.

Millman and Stosur will be looking to emulate the efforts of wildcard Jordan Thompson in joining Nick Kyrgios in the second round.