New US Open champion Carlos Alcaraz says everything has come "so fast" after he won his first major title in New York and became the youngest men's world number one in history.
"It's crazy for me. I never thought I was going to achieve something like this at 19 years old," he said.
Rafael Nadal said he was sure it would be the "first of many" for Alcaraz.
The 36-year-old Spaniard, who has won a record 22 men's singles major titles, congratulated his compatriot shortly after he sealed victory at Flushing Meadows.
"Well, I have one.