Casemiro was unlikely scorer of Real's second; his long-range shot took a huge deflection off Sami Khedira. Ronaldo pounced on Juve's sleeping defence to put Real Madrid further ahead with 25 minutes left of game.
Cristiano Ronaldo scored twice as holders Real Madrid secured a 3-1 win at Borussia Dortmund to maintain their 100 per cent record in Champions League Group H.
Tottenham Hotspur showed they "can handle" playing at the highest level, striker Harry Kane said after his team took a big stride towards the Champions League knockout phase with a point at Real Madrid.
Dani Ceballos scored twice on his first league start for Real Madrid as they beat struggling Alaves. The 21-year-old Spanish midfielder, signed from Real Betis in the summer, held off two defenders before striking home his first.
Casemiro put Real Madrid ahead in the 24th minute with a cute finish from Dani Carvajal's diagonal ball. Isco doubled the Champions League winners' lead after scything through the Manchester United back line.
Real eased off in the second half, with the cup practically wrapped up, and Barca improved slightly as a result, with Lionel Messi and Luis Suarez hitting the woodwork.
Two goals to the good, Real Madrid were home and dry and Sergio Ramos locked up the full three points on 61 minutes when Gareth Bale headed down a Marcelo cross only to see the Real Madrid captain swing a bicycle kick at it and put the game
Manchester United's B team took the game to the Real Madrid stars in the first half, handing a 1-0 over to their big guns following Jesse Lingard's late goal from amazing Anthony Martial solo through 3 player, but the youth of Los Blancos shined
In each of the last two seasons, Real have had the bigger budgets. In 2016/2017, Zinedine Zidane's team had a cap of €419m (£370m), compared to Barca's €390m (£345m).