Dustin Johnson, Jordan Spieth qualify for U.S. men's Olympic golf team

Though the cutoff for golfers to qualify for this summer's Rio Olympics doesn't come until July 11, the four spots available for American men are already locked in.

Dustin Johnson, Jordan Spieth, Bubba Watson, and Rickie Fowler are guaranteed to remain as the four highest-ranked U.S. golfers in the Official World Golf Ranking through this week, according to Kevin Maguire of ESPN.

This is due in part to this week's scheduled PGA Tour event - the Greenbrier Classic - being cancelled due to flooding in West Virginia. Meanwhile, no Americans competing in the European Tour's Scottish Open are able to catch Fowler in the rankings.

It is unknown if all four golfers will accept the invitation, though, as Zika concerns are causing more and more players to withdraw from the event, including world No. 1 Jason Day and four-time major champion Rory McIlroy.