Former US Open champion Bryson DeChambeau has joined the Saudi-backed LIV Golf Invitational Series, tournament officials have announced.
DeChambeau had previously been linked to the breakaway circuit but said in February that "as long as the best players in the world are playing the PGA Tour, so will I."
Dustin Johnson also said he was "fully committed" to the PGA Tour on the same day, but subsequently resigned his membership and is competing in the opening £20milion, 54-hole event at Centurion Club this week.
Minutes after the first shots were struck on Thursday, the PGA Tour suspended all 17 players in the field who were taking part, despite having been turned down for the required releases, and said "the same fate holds true" for players participating in future LIV Golf events.
PGA Tour commissioner Jay Monahan added: "The same fate holds true for any other players who participate in future Saudi Golf League events in violation of our regulations."
LIV Golf CEO Greg Norman, who is expected to sign more players ahead of the second event in Portland, Oregon from 30 June to 2 July, said: "Bryson DeChambeau is an exciting addition to LIV Golf's supercharged style of play.
"He is passionate about the sport, innovative in his approach and committed to pushing the boundaries in pursuit of excellence.
"He's not afraid to think outside the box and supports our mission of doing things differently to grow our game.
"The power and energy he brings to the course will deliver added electricity to our competition in Portland and beyond."