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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.
The Greek became the first player in the professional era to win his first three Monte Carlo finals in straight sets.
Nagal threatened to spoil Rune's party by taking the second set after the second round match, which was suspended due to rain on Wednesday, resumed. However, he lost his serve twice in the final set.
Nagal became the first Indian player to win a singles main draw match at an ATP Masters event on clay.
Sinner won 88 per cent of his first serve points and thumped 15 winners to capture the title in South Florida after finishing as the runner-up in 2021 and 2023.
Bopanna and Ebden rallied to down Ivan Dodig and Austin Krajicek 6-7(3), 6-3, 10-6 in a hard-fought final.
'This is a miracle,' said Nardi, who lost to David Goffin in the qualifiers and only got into the main draw after Tomas Etcheverry withdrew due to injury.