Novak Djokovic has said he will not give up up on Grand Slams and will 'keep fighting' after he was knocked out of the US Open by Carlos Alcaraz in the semi-finals.

Alcaraz soaked up everything Djokovic could throw at him before marching into his second US Open final and denied the 38-year-old a shot at a record-breaking 25th Grand Slam title.

Djokovic came into the clash hoping to bridge a 16-year age gap in his fourth Grand Slam semi-final of the season, but the Spaniard claimed a 6-4 7-6 (7-4) 6-2 victory.

"I'm happy with my level of tennis, but it's just the physicality of it," Djokovic said after his defeat.

"As I said after the quarter-finals, I'm going to do my very best to get my body in shape to sustain that level and rhythm for as many hours as it's needed, but it wasn't enou

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