Na posted his best finish in seven U.S. Open starts by placing solo seventh at Oakmont (Pa.) Country Club in 2016, shooting three sub-70 rounds at Oakmont Country Club to place solo seventh. He earned his fourth PGA Tour victory in the 2019 Shriners Hospital for Children Open. He also claimed the 2019 Charles Schwab Challenge at Colonial Country Club. Born in the Republic of Korea, Na emigrated to the U.S. when he was eight years old and left Diamond Bar High School in Southern California after his junior year to turn professional at age 17. He earned his 10th U.S. Open start by qualifying for the season-ending Tour Championship last year.
U.S. Open Record
| Year | Site | Scores | To Par | Finish |
| 2021 | Torrey Pines Golf Course (South Course) | 77-73 | +8 | MC |
| 2020 | Winged Foot Golf Club (West Course) | 75-77 | +12 | MC |
| 2019 | Pebble Beach Golf Links | 72-77 | +7 | MC |
| 2017 | Erin Hills | 68-76-73-71--288 | E | T-32 |
| 2016 | Oakmont Country Club | 75-68-69-69--291 | +1 | 7th |
| 2015 | Chambers Bay | 70-72-72-74--288 | +8 | T-46 |
| 2014 | Pinehurst Resort & C.C. (Course No. 2) | 68-69-73-73--283 | +3 | T-12 |
| 2012 | The Olympic Club (Lake Course) | 74-71-71-73--289 | +9 | T-29 |
| 2011 | Congressional Country Club (Blue Course) | 80-75 | +13 | MC |
| 2010 | Pebble Beach Golf Links | 80-77 | +15 | MC |