Fans started to gather in the early afternoon at a Nike store in the city and the excitement built as more people arrived.
One fan - Carlos, aged 20 - was wearing a United shirt signed by various players. He told ManUtd.com, "It was an emotional experience lifting the trophy, I couldn't believe it."
Betty Brown, a young Mexican of Scottish descent who has supported United all her life, gave the silverware a quick kiss before lifting it. "My dream is to one day go to Old Trafford," said Betty.
Like a lot of people in Mexico, Betty watches every United match, even if that means getting up at 06:30 in the morning, and cites Eric Cantona as her favourite player of all time with Ryan Giggs as her current favourite.
Marco had sneaked out of work early to get a peek at the trophy and even gave us a rendition of some United terrace chants.
"I'm 100 per cent dedicated to United," declared Marco.
Local press from Guadalajara showed up and were keen to interview Jim Turner, whose job it is to look after the trophy and keep it with him at all times. He calls it his "baby".
"The trophy comes onto the plane with me and has its own seat next to me," explained Turner. "It sleeps with me, goes into my bedroom and it stays with me everywhere."