Springboks flanker Pieter-Steph du Toit was named World Rugby's men's player of the year, with Wallace Sititi taking out the men's breakthrough player award.
Sinner defeated Tallon Griekspoor in straight sets after Matteo Berrettini defeated Botic van de Zandschulp to make Italy the first country to win back-to-back titles in more than a decade.