German won the season finale in 2018
The 24-year-old, who lifted the 2018 Nitto ATP Finals trophy in London, will compete in the season finale for the fifth consecutive year.
“I’ve had my best season so far and I am really happy to have qualified,” Zverev said. “I will be playing in Turin for the first time and I love competing in Italy in front of passionate fans. I have had good results in Italy and hope it will continue that way.”