Slattery will make his third U.S. Open start after shooting 9-under 135 in the Surrey, England, sectional qualifier conducted on the Old and New courses at Walton Heath Golf Club. The Englishman owns seven professional victories, two of which have come on the European Tour. His last win was the 2015 M2M Russian Open.
U.S. Open Record
| YEAR | SITE | SCORES | TO PAR | FINISH |
| 2019 | Pebble Beach Golf Links | 73-72 | +3 | MC |
| 2016 | Oakmont Country Club | 72-68-78-76--294 | +14 | T-57 |
| 2012 | The Olympic Club | 79-70 | +9 | MC |