Story highlights Jason Day withdraws from Olympics

World No. 1 cites fear over Zika virus

Several big golf names already out

Rory McIlroy withdrew this month

(CNN) He's the best golfer on the planet -- but Jason Day won't be winning Olympic gold anytime soon.

The world. No. 1 withdrew from Rio 2016 Tuesday after citing fears over contracting the Zika virus.

His move comes after four-time major winner Rory McIlroy pulled out this month for similar reasons, while several other of the sport's big names have also said they won't travel to South America.

While the symptoms of the virus -- which include a rash, headaches and joint pain -- aren't severe, Zika has been linked to microcephaly in newborn babies and some cases of the muscle-weakening disease Guillain-Barré syndrome in adults.

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