It wasn't a very exciting game but it was a demonstration of containment and holding onto a lead.
Antonio Conte gave the former Chelsea manager Jose Mourinho his own medicine. Eden Hazard scored the opener from the penalty spot mid-way through the first half, after he was brought down in the box.
Here's how football fans in South Africa reacted to the big game as it happened.
COME ON UNITED! #FACupFinal— James keene (@JamesKeene28) May 19, 2018
Situation... pic.twitter.com/ZU3eIIbllY— Michael Morton (@MMORTON6) May 19, 2018
Out with the family pic.twitter.com/J12rhc1Irc— aj15jali (@andilejali870) May 19, 2018
C'mon UNITED!!! pic.twitter.com/xWFyfCwMNk— henrico botes (@_henna9) May 19, 2018
That’s 90 minutes of my life I’ll never get back - what a poor quality #FACupFinalِ— Ian Cheeseman (@IanCheeseman) May 19, 2018