Collin Morikawa

The Northern Irishman appeared to rip his shirt open in the recording area behind the 18th green.

American makes history with victory.

Morikawa had the chance to top the Order of Merit by winning last year’s DP World Tour Championship.

The American is racking up the miles as he contends at the start of the PGA Tour season and the end of the European Tour campaign.

The PGA Tour remains in Las Vegas this week and several players in the field have some home advantage which could prove significant.

Morikawa carded a closing 69 at The Concession Golf Club to finish 18 under par.

The 23-year-old was playing in only his second major.

The 23-year-old triumphed at the US PGA Championship thanks to a magnificent final round of 64.

The US player held off England’s Paul Casey, who finished tied for second with Dustin Johnson.

The 23-year-old emerged from a seven-way tie to snatch the lead in California.