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 last fall in the 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.
U.S. Open Record
| Year | Site | Scores | To Par | Finish |
| 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 | 74-71-71-73--289 | +9 | T-29 |
| 2011 | Congressional Country Club | 80-75 | +13 | MC |
| 2010 | Pebble Beach Golf Links | 80-77 | +15 | MC |