World number two Dustin Johnson, who won his first major title at the US Open Golf Championship in June, won't play in the Rio Olympics because of concerns over the Zika virus.
In a statement released to the Golf Channel on Friday by his agent, David Winkle of Hambric Sports Management, Johnson said his hopes of expanding his family with fiancee Paulina Gretzky meant it would be "irresponsible" to risk contracting the mosquito-borne virus that has been linked to birth defects.