Britain's Andy Murray has taken the first set 6-1 in his Australian Open first round match against Japan's Go Soeda.
Murray makes his return to Grand Slam action for the first time since back surgery in September.
More top news
Guillier conceded a "severe defeat" defeat to his supporters as the result came in.
The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.