WATCH: DeChambeau shows huge lack of respect to McEvoy on 18th green

Bryson DeChambeau showed a huge lack of respect for his playing partner and European Open winner Richard McEvoy for how he handled defeat on the 18th green.

DeChambeau, 24, has progressed nicely up the world rankings to 23rd this season, but threw away his chance of a maiden European Tour title when playing his final four holes of the European Open in 5-over par to finish in a tie for 13th.

McEvoy, 39, buried a 15-foot putt for birdie on the final hole to prevail by one stroke and land his first European Tour title in 285 career starts, shortly before the American tapped home for a treble-bogey eight after finding the water twice. 

DeChambeau walked over to McEvoy and gave what European Tour pro Eddie Pepperell described as a "classless handshake." Watch the incident below to make your own mind up...

@b_dechambeau
Didn't do yourself any favours there Bryson! Plenty of style - but no class. pic.twitter.com/bLD4Pies4I

— Noel Gallagher (@estshuffle) July 29, 2018

Has to be said, as far as classless handshakes go, that was a good’n!

— Eddie Pepperell (@PepperellEddie) July 29, 2018

DeChambeau has since taken to social media to apologise for his actions...

Tough finish today at the @peo_18 , but overall I had a great week in Hamburg. Thank you to Porsche European Open for having me. A terrific golf course with great support from the fans. I apologize to Richard McEvoy and the fans for my brevity on 18. He is a class act, worthy champion and I enjoyed playing with him the past two days. Looking forward to next week in Akron at the @wgc_bridgestone and continuing to work hard on my game

A post shared by Bryson DeChambeau (@brysondechambeau) on Jul 29, 2018 at 12:35pm PDT