Alcaraz is the youngest player to reach the US Open final since Pete Sampras in 1990
The Spaniard had to come from behind to beat Jannik Sinner in a thrilling 5-set encounter
So far Alcaraz has spent more than 20 hours on court with three 5-set matches in a row
In another 5-setter he outclassed home favourite Frances Tiafoe
If he wins the US Open crown, he will be World No.1 at young age of 19
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