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From next season, seven of the nine ATP Masters 1000 events will be held across 12 days.
Bolelli and Vavassori, the fourth seeds, dominated from the outset.
The third seed, Zverev produced 15 winners and nine unforced errors, compared to 12 and 25, respectively, for Humbert.
The season-ending tournament will be held at Turin from November 10-17.
The Spaniard's career has been hampered by injuries. He missed the 2023 French Open and was beaten in the first round this year.
Yuki Bhambri and his French partner Albano Olivetti finished runners-up at the Chengdu Open.
Nadal missed almost all of 2023 with a hip problem and his comeback earlier this year was stalled by a muscle tear.
The announcement marks the PIF's latest foray into tennis, after the men's ATP tour also signed a multi-year 'strategic partnership' earlier this year.
The 27-year-old warmed up for the French Open by winning his sixth Masters title when he beat first-time finalist Nicolas Jarry.
In just over two hours, a feisty Lehecka thwarted Nadal's hopes of reaching his 100th Masters 1000 quarterfinals.
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