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One of the most stacked months of the tennis calendar, March features two major back-to-back tournaments at the BNP Paribas Open and Miami Open. That makes the Sunshine Swing the best time watch the ATP and WTA Tours' top players—and maybe spot a few stars in the process.

Given their close proximity to global entertainment industry hubs in Southern California and South Florida, it’s no surprise that these two fortnights are also some of the most star-studded on the WTA and ATP Tour.

From Kardashians to Grammy-winning musicians, Baseline's Mad March series highlights our favorite Sunshine Swing celebrity sightings over the years:

Who can forget Justin Bieber's 2015 appearance at Desert Smash, alongside Genie Bouchard, Will Farrell and Kevin Hart?

Who can forget Justin Bieber's 2015 appearance at Desert Smash, alongside Genie Bouchard, Will Farrell and Kevin Hart?

Billionaire's row: BNP Paribas Open tournament owner Larry Ellison (center) and Bill Gates take in the action.

Billionaire's row: BNP Paribas Open tournament owner Larry Ellison (center) and Bill Gates take in the action.

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The worlds of music and tennis have collided quite regularly in Indian Wells and Miami:

Singer Gwen Stefani (center) was a regular during Roger Federer's Indian Wells matches, pictured here with Mirka Federer (right) and former world No. 4 Mary Joe Fernandez (left).

Singer Gwen Stefani (center) was a regular during Roger Federer's Indian Wells matches, pictured here with Mirka Federer (right) and former world No. 4 Mary Joe Fernandez (left).

Colombian singer Shakira snapped this photo with Rafael Nadal in 2009, the same year he starred in her music video for "Gypsy".

Colombian singer Shakira snapped this photo with Rafael Nadal in 2009, the same year he starred in her music video for "Gypsy".

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Enrique Iglesias and longtime girlfriend Anna Kournikova—a former WTA world No. 1 in doubles—enjoyed a few Miami matches.

Enrique Iglesias and longtime girlfriend Anna Kournikova—a former WTA world No. 1 in doubles—enjoyed a few Miami matches.

While Indian Wells draws out big names from tech and Hollywood, Miami has no shortage of reality and sports celebrities either:

Kim Kardashian and mom Kris Jenner had a front row view during the 2010 Miami Open.

Kim Kardashian and mom Kris Jenner had a front row view during the 2010 Miami Open.

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David Beckham snapped photos with his family during the 2018 tournament, the last edition held in Key Biscayne.

David Beckham snapped photos with his family during the 2018 tournament, the last edition held in Key Biscayne.

Who will we spot courtside during the Sunshine Swing in 2023?