Arielle, 17, is making her Olympic debut in Sochi as the youngest of the U.S. halfpipe snowboarders. She is the 2013 world champion and was considered a medal contender for the Americans alongside gold medal threat Kelly Clark.
Australian golfer Marc Leishman will miss the Rio Olympics due to his wife’s health.
“Many of you may know that last April my children and I almost lost my wife, Audrey, to toxic shock syndrome,” Leishman said in a statement. “Since then Audrey has been prone to infection and is far removed from 100 percent recovery of her immune system.
“We have consulted with Audrey’s physician and due to her ongoing recovery from toxic shock and potential risks associated with the transmission of the Zika virus, it was a difficult yet easy decision not to participate.
“I missed playing in the 2015 Masters tournament to be at her side when she was originally stricken and I cannot risk placing her health in jeopardy.
“The Masters and the Olympics are the two biggest tournaments to which a golfer can be invited; however, my family will always come before golf.”
Leishman, 32 with one PGA Tour win, joined the projected Olympic field when countryman Adam Scott said last month that he would skip Rio.
World No. 1 Jason Day is assured one of two Olympic spots for Australian men when the 60-man field is determined based on July 11 world rankings.
With No. 7 Scott and No. 35 Leishman out, the next-best Aussie is No. 63 Marcus Fraser.
Three more major champions — Vijay Singh, Louis Oosthuizen and Charl Schwartzel — also said in April they would not compete in Rio.
Golf returns to the Olympics for the first time since 1904.