Casey participated in the WGC Match Play final in March. He enjoyed two holes of the first match, but then lost it again due too many spasms. He did not play in his next two matches, and subsequently withdrew from the Masters and PGA Championship.
The U.S. Open will begin June 16 at The Nation Membership.
Casey was modified by Adam Hadwin, the Dallas qualifier’s first alternative last month.
Casey’s spokesperson stated that Casey is optimistic that his game will improve once again in time to play at the British Open at St. Andrews next month.