Hours from playing in the biggest final of his young career, Taylor Fritz was in severe pain. The prospect of having to withdraw against Rafael Nadal nearly had him in tears. (More tennis News)

His coach urged him not to potentially risk damaging his sore ankle further. Fritz stubbornly refused to bow out.

His faith in himself paid off. Fritz upset Nadel 6-3 7-6 (5) on Sunday to win the BNP Paribas Open and snap the 21-time major champion's 20-match winning streak this year.

"It was a complete non-issue, didn't feel it at all, didn't hinder me at all," said Fritz, who tweaked his ankle late in his semifinal win over No. 7 seed Andrey Rublev. Blue medical tape could be seen above his high sock and he had it numbed before the final.

Nadal had his own health issue.

He came into the match bothered by painful breathing that he first experienced in a three-set semifinal win. He took two medical timeouts during the final. The first one came after he lost the first set. Nadal went inside with a trainer after tapping his upper left chest. He got treatment on court after falling behind 5-4 in the second set.

"When I try to breathe, it's painful and it's very uncomfortable. It's like a needle all the time inside. I get dizzy a little bit because it's painful. It's a kind of pain that limit me a lot," said Nadal, who turns 36 in June.

"The thing that worries me now, it's about what's going on there, what I have to do now to recover and how long going to take."?

Nadal's 20-0 start to the year included the Australian Open, his 21st major championship that broke a tie with Novak Djokovic and Roger Federer. He also won titles in Melbourne and Acapulco.

"Of course, the last two months have have been amazing, unforgettable, very emotional," Nadal said.?

"I enjoy things that I never thought I could live again a few months ago."?

In an error-filled women's final, Iga Swiatek defeated Maria Sakkari 6-4, 6-1. The 20-year-old Polish player and Fritz earned USD 1.2 million each for their victories.

Fritz didn't waste any time in attacking Nadal, racing to a 5-1 lead in the first set with two breaks. Nadal got a break back in closing to 5-3, but his backhand error gave Fritz another break and the set.?

"It's an honour to even be on the same court as this guy," Fritz told the crowd.?

"I grew up watching this guy win everything."?

Nadal fought off a match point on his serve with a forehand winner to tie the second set 5-all. He had two break points on Fritz's serve in the next game, but the American held for a 6-5 lead. Nadal held to force the tiebreaker.

Nadal sent two straight forehands well wide to set up Fritz's second match point. Another Nadal error sent Fritz to the biggest victory of his career not far from where he grew up near San Diego. Fritz's parents, Guy Fritz and Kathy May, are former tour players.

"He told me that I was going to win this tournament one day when I was a little kid," Fritz said.?

"It was pretty tough not being emotional with my parents, especially my dad. He was just really, really proud of me. It's really tough to get a compliment out of him."?

Fritz dropped his racket and collapsed on his back after clinching the title on his second match point. He got up smiling with a look of disbelief on his face. He became the first American man to win Indian Wells since Andre Agassi in 2001.

"I just kept telling myself there's no reason why I can't win this," Fritz said.?

Fritz is projected to rise from No. 20 to a career-high 13th in Monday's ATP Tour rankings and will become the top-ranked American player. Nadal moves up to No. 3.

Nadal had already decided to skip next week's tournament in Miami and head home to Spain to prepare for the French Open that begins May 22.

Fritz is scheduled for a MRI on his ankle Monday and isn't sure whether he'll be able to play in Miami.

Swiatek will rise from fourth to a career-best No 2 in the world in Monday's WTA Tour rankings, trailing top-ranked Ash Barty, who skipped Indian Wells.?

"Right now, it's too surreal to describe it, honestly," Swiatek said.?

"But for sure I want to go higher because I feel like getting the No 1 is closer and closer."?

Sakkari will move from sixth to No 3, the rising Greek star's highest ranking yet.?

She equals countryman Stefanos Tsitsipas, who reached No 3 in the ATP Tour rankings.

Swiatek lost each of the first three times she played Sakkari, all last year. Last month, the 20-year-old Polish player beat Sakkari in the semifinals at Doha and went on to win the title.

Swiatek has five career titles, including the 2020 French Open. She's 5-0 in her last five finals, losing only a combined 16 games. Her new ranking equals the highest ever by a Polish player, matching Agnieszka Radwanska.

Gusty winds affected serves and shots by both players, who had seven double faults each. There were seven service breaks in the first set alone, with Swiatek holding twice. Sakkari held once to tie the set, 4-all.?

Swiatek improved her record to a WTA Tour-leading 20-3 this year, including 11 matches in a row.