Carlos Alcaraz says he is "heartbroken" after withdrawing from Spain's Davis Cup Finals team because of injury.
World number one Alcaraz, 22, who was beaten by Jannik Sinner at the ATP Finals on Sunday, says he has been advised not to compete because of swelling in his right hamstring.
Spain face the Czech Republic in the Davis Cup quarter-finals in Bologna, Italy on Thursday.
Spaniard Alcaraz, who won the French and US Open titles this year to take his career Grand Slam tally to six, wrote on Instagram that playing for his country was the "greatest thing there is", adding: "I'm going home heartbroken.