In 2008, Nagasu became the youngest woman since Tara Lipinski in 1997 to win the U.S. senior ladies' title, and the second-youngest in history at the time.

[4] This also made her the first senior ladies skater ever to land eight triple jumps (the maximum allowed in the free skate under the Zayak rule) cleanly in international competition.

They are immigrants from Japan[7][8] and their daughter had dual citizenship[9] but was required by Japanese law to relinquish it before her 22nd birthday,[10][11] so she chose U.S.

[17] She graduated from the Capistrano Connections Academy in June 2011[18] and was accepted into the University of California, Irvine but said the commute was not feasible.

[23] In June 2024, Nagasu announced her engagement to Michael Bramante (a year prior) and the birth of her son, Tai.

Nagasu's secondary coaches included Sashi Kuchiki, Sondra Holmes, Bob Paul, and Jim Yorke, with whom she worked on a once a week basis to refine various details of her skating.

[33][34] After placing first in the free skate by a margin of 3.19 points over Zhang,[35] Nagasu won the overall title with a combined score of 155.46.

[39] Zhang, Nagasu, and Wagner constituted the first ever sweep by the United States of the World Junior ladies' podium.

At the 2007–08 ISU Junior Grand Prix event in Lake Placid, New York, the first Junior Grand Prix competition of her career, Nagasu won both the short and free programs to win the gold medal with a 26.47-point lead over silver medalist Alexe Gilles.

[43] At the 2007–08 Junior Grand Prix Final in Gdańsk, Poland, she won the short program by a margin of 4.72 points over the second-place finisher, Yuki Nishino.

[46] Skating as a senior, Nagasu won the short program at U.S. Nationals,[47] 5.08 points ahead of second-place finisher Ashley Wagner.

[50] Although now a senior national champion, Nagasu did not meet the International Skating Union's age criteria to compete at the World Championships.

[52] For the second year in a row, Nagasu was part of an American sweep of the podium, winning the bronze medal 8.95 points behind silver medalist Zhang, and 9.30 behind Flatt, who took the gold.

At the U.S. Nationals in January, Nagasu finished fifth overall after a free skate that included two downgraded triple flip jumps.

[54] Nagasu was selected to compete at the 2009 World Junior Championships but decided not to participate due to a foot injury.

She worked as a television commentator in Japanese for Fuji TV during the 2009 World Championships, which were held in Los Angeles.

[57] For the 2009–10 season, Nagasu was assigned to the 2009 Cup of China and the 2009 Skate Canada International Grand Prix events.

[59] Following the event, she was nominated to represent the United States at the 2010 Winter Olympics and was also selected to compete at the World Championships along with Flatt.

[24] She still earned enough points to win the free skate, scoring 109.07, and won the silver overall, her first senior Grand Prix medal.

[68][69] In the long program, she received zero points for a botched flying sit spin and finished third overall to win the bronze medal.

At her 2011–12 Grand Prix assignments, Nagasu came in fifth at the 2011 Skate Canada International and won the silver medal at the 2011 Cup of China.

At the time, she was coached several days a week by Frank Carroll in Cathedral City, California (near Palm Springs), and also worked with Rafael Arutyunyan in Lake Arrowhead, with Galina Barinova in Artesia, and on her own in Pasadena.

"[76] She decided to be coached by Wendy Olson and Amy Evidente at the Pickwick Ice rink in Burbank, California, which was a short drive from her home.

At the 2013 Rostelecom Cup, she placed fourth in the short program, third in the free skate, and won the bronze medal.

Although the United States was able to send a three-woman team to the ladies' singles figure skating event at the 2014 Winter Olympics in Sochi, Russia, U.S.

In the spring of 2015, Nagasu briefly worked with Alexei Mishin on her jumps when he and his students went to temporarily train at the Broadmoor Skating Club, the rink Nagasu trains at, in Colorado Springs, for a week due to the lack of ice time they were getting in Saint Petersburg.

Her combined score of 193.86 at the competition earned her a new personal best,[92] and won her the silver medal behind Satoko Miyahara.

Later, Nagasu revealed that she underwent a surgery to repair a torn labrum in her hip, which had bothered her since she started practicing the triple Axel jump.

As of December 2020, Nagasu announced that she was "most likely done competing" and is currently working as a coach at the North Star Figure Skating Club in Westboro, Massachusetts.

[101] Nagasu is considered a strong spinner, and has received a straight +3.00 grade of execution for her layback spin.