Carlos Alcaraz of Spain won his first Grand Slam tournament and become the youngest male tennis player to achieve the number one rating in the world.

On Sunday, the 19-year-old defeated Casper Ruud of Norway 6-4, 2-6, 7-6, 6-3 in the US Open final.

Alcaraz is the youngest male Grand Slam champion since Rafael Nadal won the French Open in 2005 and the youngest US Open champion since Pete Sampras in 1990.

Alcaraz collapsed to his back and put his hands to his face before jumping up to greet Ruud at the net after winning the match. "This is something I've dreamed of since I was a child: to be number one in the world and the champion of a Grand Slam," he said.

Then, he climbed through cameras and into the stands to celebrate with his squad in their box.

"This is something for which I worked very, very hard. There are a lot of emotions right now, making it difficult to speak."

Alcaraz, whose acrobatic play wowed fans during the two-week competition in New York, has displaced Daniil Medvedev at the top of the standings.

He is the youngest world number one since the ATP rankings began in 1973, surpassing Lleyton Hewitt, who was 20 years old when he ascended to the top spot in 2001.

Alcaraz's journey to victory was arduous, and he holds the record for the longest time spent on the court at a single Grand Slam tournament.

The majority of the 23 hours and 40 minutes were consumed by the 13 hours he spent playing three consecutive five-setters to reach the final.

Alcaraz stated, "In the final round of a Grand Slam or any tournament, there is no room for fatigue." You must give everything you have within you.

Nadal complimented the player who is often seen as his successor.

"Congratulations @carlosalcaraz on your first Grand Slam and No. 1 ranking, the culmination of your fantastic season, which I am certain will be followed by many more," he tweeted.

Ruud attempted to become the first Norwegian to win the top position but was unable to match Alcaraz's strength.

Ruud, who lost the French Open final to Rafael Nadal, has risen from seventh to second in the global rankings.

"Tonight was a memorable occasion for both Carlos and myself. We understood the stakes," Rudd added.

"Number two is also acceptable. I will continue to pursue my maiden Grand Slam and world No. 1 position."