Spanish teenager Carlos Alcaraz won his first Grand Slam title at the US Open on Sunday, becoming the youngest man to ascend to the world number one ranking, reports AFP.

The 19-year-old beat Norway's Casper Ruud in the final by 6-4, 2-6, 7-6 (7/1), 6-3.

On a day of landmarks, he is also the youngest champion in New York since Pete Sampras in 1990.

Both men saved break points in their opening service games before Alcaraz gained the only break of the first set for a key 3-1 lead.

Ruud dropped the set but triumphed in terms of sportsmanship when he called a double bounce on himself in the eighth game, conceding the point to the Spaniard.

Alcaraz served it out to love and a one set lead courtesy of his 13 winners to six for the Norwegian.

The Spanish teenager, who went into the final with a 2-0 winning record over Ruud, squandered a break point at 2-2 in the second set.

Ruud made him pay, edging ahead for 4-2 and then levelling the final on a second set point after another careless Alcaraz drop-shot opened the court invitingly for the Norwegian.

Alcaraz was ahead for 2-0 in the third set before Ruud hit back.

The 23-year-old Norwegian had two set points in an 11-minute 12th game but was unable to convert as Alcaraz put away inch-perfect, back-to-back volleys.

Alcaraz made the most of his reprieve, racing through to his first tiebreak success of the tournament as Ruud's game fell suddenly apart.

The Spaniard sensed his chance, breaking for 4-2 in the fourth set before taking his aces count to 12 to lead 5-2.

Ruud held to love but Alcaraz claimed his slice of history on a second match point before collapsing to the court in celebration after three hours and 23 minutes of action.

Bd-pratidin English/Lutful Hoque