- Mickelson officially withdraws from this month's US Open
- Will instead attend daughter's graduation
- Replaced by Roberto Diaz
(CNN)Victory would have made him just the sixth man in golf history to win all four majors, but Phil Mickelson will not be traveling to Erin Hills, Wisconsin, for this year's US Open.
Family takes precedence for the five-time major winner, who will instead attend the graduation ceremony of his daughter, Amanda.
"As I look back on life, this is a moment I'll always cherish and be glad I was present," he told reporters after the third round of June's Memorial Tournament.
Mickelson will be replaced by Mexican world No. 396 Roberto Diaz, a 30-year-old making his tournament debut.
It will be the first time the US Open has been contested without Mickelson or 14-time major winner Tiger Woods since 1994.