Even with an error at the beginning of his free skate, Nathan Chen was unbeatable Sunday, winning his fifth straight U.S. Figure Skating Championship.

Not since Dick Button won each title from 1946-52 has any American man had such a streak of success. Throw in two world championships and being unbeaten since not medaling at the 2018 Olympics, and Chen already has a resume for the ages.

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Madison Hubbell and Zachary Donohue perform during the free dance at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

Even with an error at the beginning of his free skate, Nathan Chen was unbeatable Sunday, winning his fifth straight U.S. Figure Skating Championship.

Alexa Knierim and Brandon Frazier perform during the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

“It's incredible to try to follow in his footsteps,” Chen said of Button, a two-time Olympic winner.

Alexa Knierim and Brandon Frazier react after receiving the top score in the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

"Wasn’t really exactly the skate I’d like to have, but at least I was able to stand up on all the rest of the jumps and I guess move on from here.”

Bradie Tennell performs during the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Other winners at nationals, which could be the last significant competition of the season should worlds in March at Stockholm be canceled for the second straight year, were: Bradie Tennell with her second women's title; Madison Hubbell and Zach Donohue for their third ice dance championship; and Alexa Knierim and Brandon Frazier in pairs.

Bradie Tennell reacts as she hears her scores from the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Bradie Tennell reacts as she hears her scores from the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

At age 21.

Madison Hubbell and Zachary Donohue perform during the free dance at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

Madison Hubbell and Zachary Donohue perform during the free dance at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

“It's incredible to try to follow in his footsteps,” Chen said of Button, a two-time Olympic winner.

Chen pretty much ignored the rough beginning of his free skate, when he put his hands down and stepped out of a quad lutz. He hit four more quads, three in combination, and a triple axel deep into his program. There was a fluidity to his choreography and spins, and his 322.28 points were unmatchable by anybody in the field.

“I was a little timid today. Honestly that’s on me," Chen said. "I feel like I didn’t really tackle my elements. I was focusing on conserving energy. That’s not the right approach. I think that’s what caused the first element to have an error. The rest of the program I was trying to make sure I stayed on my feet. That was my mindset throughout the program.

Alexa Knierim and Brandon Frazier perform during the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

Alexa Knierim and Brandon Frazier perform during the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

"Wasn’t really exactly the skate I’d like to have, but at least I was able to stand up on all the rest of the jumps and I guess move on from here.”

His main challengers couldn't stand up throughout their free skates, and Vincent Chou's 291.38 total wasn't in the same stratosphere as Chen. Chou popped a quad flip and fell on a quad lutz, but the 2018 Olympian still held on to second place.

Jason Brown, the final competitor at these fan-less nationals at the Orleans Arena — they were moved from San Jose, California, due to the COVID-19 pandemic — stayed in third place at 276.92 points.

Alexa Knierim and Brandon Frazier react after receiving the top score in the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

Alexa Knierim and Brandon Frazier react after receiving the top score in the pairs free skate at the U.S. Figure Skating Championships, Saturday, Jan. 16, 2021, in Las Vegas. (AP PhotoJohn Locher)

Other winners at nationals, which could be the last significant competition of the season should worlds in March at Stockholm be canceled for the second straight year, were: Bradie Tennell with her second women's title; Madison Hubbell and Zach Donohue for their third ice dance championship; and Alexa Knierim and Brandon Frazier in pairs.

Knierim had won two titles with husband Chris, who retired before this season, and Frazier had earned on with previous partner Haven Denney.

AP Sports Writers Barry Wilner and Bernie Wilson contributed.

Bradie Tennell performs during the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Bradie Tennell performs during the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Bradie Tennell reacts as she hears her scores from the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Bradie Tennell reacts as she hears her scores from the women's free skate at the U.S. Figure Skating Championships, Friday, Jan. 15, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)

Nathan Chen performs during the men's free skate at the U.S. Figure Skating Championships, Sunday, Jan. 17, 2021, in Las Vegas. (AP PhotoJohn Locher)