This was the first trophy won by Santiago Solari as Real Madrid boss and Los Blancos' second of 2018.
And he was in buoyant mood after the game.
When going forward, Real Madrid has struggled with their creativity and looked toothless at times. "I congratulated them for their efforts".
The Brazilian, 24, excelled for the hosts throughout the tournament, scoring once and registering three assists as his side finished as surprise runners-up to Real Madrid.
Real Madrid enjoyed unprecedented success over the last few seasons and last night was no different. It was hard for us today, it was our fourth game in 10 days and we didn't have enough power. Solari's side left too many gaps at the back and more clinical opponents may have punished them, but the coach will be relieved to collect the first trophy of his reign. We must learn how to play at a higher level.
Recently-crowned Ballon d'Or victor Modric took one touch before thumping the ball into the bottom corner from outside the box to break the deadlock in the 14th minute.
A young fan of Real Madrid holds up a banner asking for Cristiano Ronaldo to come back prior to the FIFA Club World Cup UAE 2018 Semi Final match
Madrid had the final say, though, as a cross from substitute Vinicius Jr was turned into his own goal by Nader in the first minute of stoppage time.
Shortly after a deflected pass by Llorente hit the post in the third minute, Al Ain put a scare into Madrid with two chances from Hussein El Shahat.
Since the departure of Cristiano Ronaldo to Juventus, Real Madrid endured bit of slump in form as they had a rocky start to the season.
Then, in Saturday's final at Zayed Sports City Stadium, Caio set up Tsukasa Shiotani to score, a goal that proved little more than consolation against the two-time defending champions.
From that point, Real dominated the contest and their home-grown midfielder Llorente doubled the European champions' lead on the hour-mark with a superbly struck volley from outside the area.
With Real Madrid cruising, Sergio Ramos added the third in the 79th minute, powerfully heading a Modric corner into the back of the net.