World number one Carlos Alcaraz he has pulled out of the Davis Cup Finals in Bologna due to a swollen hamstring, he said on Tuesday, adding he was "heartbroken" to miss out.

The Spaniard aggravated the problem during the ATP Finals, where he lost to Jannik Sinner in Sunday's title clash, his withdrawal dealing another big blow to organisers the International Tennis Federation.

"I'm so sorry to announce that I won't be able to play for Spain in the Davis Cup in Bologna," Alcaraz said on Instagram.

"I have edema in my right hamstring and the medical recommendation is not to compete.

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