Johnson added a second major championship title in the 2015 Open Championship conducted by The R&A on the Old Course at St. Andrews, defeating Marc Leishman and Louis Oosthuizen in a three-hole aggregate playoff. Previously, the Drake University alum joined 1955 U.S. Open champion Jack Fleck as the only Iowa natives to win a major when he claimed the 2007 Masters. Johnson has earned 26 wins since turning professional in 1998, including 12 on the PGA Tour. He has been a member of five USA Ryder Cup teams and four U.S. Presidents Cup teams. In the final round of the 2014 U.S. Open at Pinehurst No. 2, Johnson recorded the 44th hole-in-one in championship history.
U.S. Open Record
| Year | Site | Scores | To Par | Finish |
| 2018 | Shinnecock Hills Golf Club | 73-73-72-70--288 | +8 | T-12 |
| 2017 | Erin Hills | 71-74-68-74--287 | -1 | T-27 |
| 2016 | Oakmont Country Club | 71-69-71-71--282 | +2 | T-8 |
| 2015 | Chambers Bay | 72-72-78-73--295 | +15 | T-72 |
| 2014 | Pinehurst Resort & C.C. (Course No. 2) | 71-74-72-72--289 | +9 | T-40 |
| 2013 | Merion Golf Club | 74-77 | +11 | MC |
| 2012 | The Olympic Club | 77-70-73-71--291 | +11 | T-41 |
| 2011 | Congressional Country Club | 71-69-72-74--286 | +2 | T-30 |
| 2010 | Pebble Beach Golf Links | 72-77-78-79--306 | +22 | T-77 |
| 2009 | Bethpage State Park (Black Course) | 75-72 | +7 | MC |
| 2008 | Torrey Pines (South Course) | 76-74 | +8 | MC |
| 2007 | Oakmont Country Club | 76-74-76-74--300 | +20 | T-45 |
| 2006 | Winged Foot Golf Club (West Course) | 73-77 | +10 | MC |
| 2005 | Pinehurst Resort & C.C. (Course No. 2) | 74-75 | +9 | MC |
| 2004 | Shinnecock Hills Golf Club | 70-73-75-80--298 | +18 | T-48 |