The game kicks off at 7:30 pm AEST.
Week three kicks off with Storm v Roosters.
Stan Sport will also provide coverage across the 10 days of the Paralympics.
Four-time Paralympic gold medallist Dylan Alcott leads Nine's coverage.
Michael Healy said he is "so immensely proud of the outstanding coverage our broadcast team delivered."
Host Scott Cam is back for an 18th season.
The Block Island premieres on Monday, 12 August.
9Gem will feature Olympics coverage 24 hours a day with Wide World of Sports commentary.
"You've got a front-row seat when you own the rights to the games. When you don't own the rights ... you are...
Mollie O’Callaghan and Ariarne Titmus attracted Nine average audience of 2.5m
The Opening Ceremony starts on Saturday, 27 July at 3:30 am.
The Comparison Man series will involve eight two-minute-long episodes voiced by commentator Gerard Whateley.
9Now's Olympic revamp comes as journalists are preparing to strike from tomorrow.
Coverage begins from 7:00 pm.
