Meghan - who the evening prior wowed in an intricate Oscar de la Renta gown - opted for black jeans and a red top for the occasion.
Her $550US Scanlan Theodore top was layered at the front and featured belt detailing.
She paired her look with heels and her hair in a half up style with a bun at the back.
Harry meanwhile wore an Invictus Games t-shirt and casual pants.
The royal couple were on their last day in Sydney - and are due to fly on to New Zealand on Oct. 28.
David Beckham was also among the crowd watching the final of the wheelchair basketball match between the Netherlands and the United States.
Speaking about the Games, ambassador Beckham said: “I know how sport can change people’s lives, I know how sport has a real power to improve people’s lives in many different ways.
“It’s been such an emotional week for everyone involved. 500 competitors, over 1000 family members is such a special thing.”