Cahill played the second 45 minutes and had the honour of wearing the captain's armband.
And he was delighted with both his team's performance and the enthusiastic 40,000-strong crowd.
"It was fantastic," Cahill told evertontv. "The lads played really well, a great crowd turned out, it is a beautiful stadium and Sydney's a great location.
"The fans were amazing, to have that many people here and to have them all screaming was brilliant, so credit to Sydney FC and ourselves."