World No. 1 Jannik Sinner said his off-court turmoil over doping accusations was “heartbreaking”, after winning the Davis Cup with Italy on Sunday night to complete a stellar year. Sinner beat Tallon Griekspoor 7-6 (2), 6-2 for a 2-0 win over the Netherlands after Matteo Berrettini put Italy ahead with a 6-4, 6-2 victory over Botic van de Zandschulp.

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