Rory McIlroy says pressure in sport is leading to increase in stress - relates illnesses . Since switching to playing with Nike clubs , he has struggled to recapture the form which saw him win four PGA Tour and two European Tour events in 2012 as well as the PGA Championship . ` England captain Jonathan Trott quit the Ashes series this week citing a stress - related illness . McIlroy says it shows the mental toll sport can take on athletes . The Northern Irishman was suspended ahead of this week 's Australian Open in Sydney .
Rory McIlroy says pressure in sport is leading to increase in stress - relates illnesses . England captain Jonathan Trott quit the Ashes series this week citing a stress - related illness . McIlroy says it shows the mental toll sport can take on athletes . The Northern Irishman was suspended ahead of this week 's Australian Open in Sydney .