WATCH: Rory McIlroy has fan ejected as Ryder Cup gets nasty

Rory McIlroy was fired up following a day of inappropriate heckling from golf fans at the Ryder Cup. Photo / Getty

A fired-up Rory McIlroy has had a fan ejected from the Ryder Cup in the US after the heckler was caught making unsavoury comments to the European golfer.

The behaviour of spectators has been a topic for discussion all week and having borne the brunt of a number of comments over the first two days of the Ryder Cup the world No.3 decided enough was enough.

While walking to the eighth tee someone from the crowd yelled "Suck a d*** Rory" directly at the Northern Irishman, according to a number of on course reporters who were following the opening match of the afternoon fourballs.

A video clip posted on Twitter showed McIlroy doubling back - with some fans urging him to carry on walking and others calling for the offender to be kicked out - and confronting the man before then asking security to remove him.

Hecklers had also chanted a rendition of Neil Diamond's classic "Sweet Caroline" - a reference to McIlroy's former fiancee Caroline Wozniacki.

Two groups further back someone shouted at Sergio Garcia, who with Spanish compatriot Rafa Cabrera Bello staged a great comeback to snatch an important half against the American's top pair of Jordan Spieth and Patrick Reed, "Sergio, you suck", which led to US vice-captain Tom Lehman telling people to calm down.

The issue of American fans was thrust into the spotlight earlier in the week after the brother of Europe's Masters champion Danny Willett wrote a column in which he called them, among other derogatory things, "cretins".

More nasty stuff out there Fri/Sat than any Ryder Cup I've covered since Sunday at Brookline. That's not good. pic.twitter.com/i7lMR6R10q

— Christine Brennan (@cbrennansports) October 1, 2016

A number of shouts from the galleries were evident on Friday's first day but with the tide seemingly turning in Europe's favour on Saturday the calls became louder and more frequent.

This was despite organisers making a first-tee announcement about good conduct and posting reminders about being respectful on the electronic scoreboards dotted around the course.