Katie Ledecky competed last month in the TYR Pro Swim Series in Indianapolis but wore the gear of several companies. (Bobby Ellis/Getty Images)

As Katie Ledecky dives into her last event before her summer swim season starts heating up, the five-time Olympic champion has signed her first endorsement deal since turning professional, partnering with swimwear company TYR.

Ledecky made the announcement Friday morning, before competing in this week’s Santa Clara, Calif., meet, which is expected to be her last event before the U.S. nationals in July.

While terms of the deal were not released, the company is calling it “the most lucrative partnership in the history of the swim industry.” The move means Ledecky has secured what should be one of her biggest sponsors through the 2020 Tokyo Olympics and locks in the swim gear that she’ll compete in as she takes aim at matching her medal haul from the 2016 Games in Rio de Janeiro.

Ledecky announced she was turning pro in March, following her sophomore season swimming for Stanford.  She competed last month in Indianapolis wearing the gear of multiple companies before apparently settling on TYR, which has sponsored the U.S. swim team since 2013.

“We share a vision of growing the sport for current and future generations of swimmers, and we will build toward that goal together,” Ledecky said in a statement. “I appreciate TYR’s investment in me, and their commitment to technology that is critical to my ongoing quest to swim faster.”

Ledecky’s season is building toward the Pan Pacific Championships in August, and she got off to a blazing start last month in Indianapolis, where she broke her own world record in the 1,500-meter race. She decided against swimming the 1,500 this week in Santa Clara but is expected to compete in the 100, 200, 400 and 800 freestyle races.

TYR has grown into a major brand in international swimming in recent years and also sponsors Olympic champions Ryan Lochte, Dana Vollmer, Matt Grevers and Leah Smith.