Indian Wells Open

The Indian Wells Open, known as the BNP Paribas Open for sponsorship reasons, is an annual professional tennis tournament held in Indian Wells, California, United States. It is played on outdoor hardcourts at the Indian Wells Tennis Garden, and is held in March. The tournament is part of the ATP 1000 events on the ATP Tour and part of the WTA 1000 events on the WTA Tour.

The tournament is the best-attended tennis tournament outside the four Grand Slam tournaments (493,440 in total attendance during the 2024 event); it is sometimes called the "fifth Grand Slam" in reference to this. The Indian Wells Tennis Garden has the second-largest permanent tennis stadium in the world, behind the US Open's Arthur Ashe Stadium in New York. The Indian Wells Open is the premier tennis tournament in the Western United States and the second largest tennis tournament throughout the United States and the Americas (behind the US Open in the Eastern United States).

Winning the Indian Wells Open and Miami Open in the same season is called the "Sunshine Double" — since they are a series of two elite, consecutive hard-court tournaments in the United States and are held in Florida (the Sunshine State) and the sunny desert community of Indian Wells.

Between 1974 and 1976, it was a non-tour event and between 1977 and 1989 it was held as part of the Grand Prix Tennis Tour. Both singles main draws include 96 players in a 128-player grid, with the 32 seeded players getting a bye (a free pass) to the second round.

Since 2024, mixed doubles has been introduced as a new category.