The ATP has announced a "multi-year strategic partnership" with Saudi Arabia's sovereign wealth fund as the state increases its involvement in professional tennis.
The ATP rankings, plus the year-end world number one award, will be named after Saudi's Public Investment Fund.
PIF on-court branding will be seen at some of the ATP Tour's biggest events, starting at Indian Wells next month.
The value of PIF's investment in the men's tour has not been revealed.
"Our strategic partnership with PIF marks a major moment for tennis," said ATP chief executive Massimo Calvelli.
"It's a shared commitment to propel the future of the sport.