And Guardiola says the occasion was special, with the amount of City fans inside the iconic venue a sign of our growth in recent seasons.
"It's an honour," he said. "We are so proud.
"When we arrived here five, six years ago and lost to United there were only a few blue shirts and now there are a lot.
"We were happy to see them and the game was really good."
Watch the full interview above!
CITY: Ortega Moreno, Walker, Ake (Phillips 45'), Mbete, Cancelo (Wilson-Esbrand 45'), Rodrigo, De Bruyne (C) (McAtee 71'), Bernardo (Kayky 76'), Mahrez (Palmer 45'), Alvarez (Delap 71'), Grealish (Lewis 76').
SUBS: Ederson, Carson, Haaland, Bobb, Burns, Knight.
CLUB AMERICA: Ochoa (C) (Jimenez), Sanchez (Layun), Lara (Valdez), Araujo, Fuentez (Reyes), Sanchez (Aquino), Dos Santos, Zendejas, Valdes, Fidalgo, Martin (Campos).
SUBS: Tapia, Martinez, Caceres, Vinas, Martinez, Moreno, Damm, , Rodriguez.