Look how far they've come.
Wallabies number eight David Pocock and Ireland halfback Conor Murray clashed in Sydney on Saturday but as the Australian pointed out on Twitter, there rivalry goes back 13 years.
Pocock Tweeted a photo of himself and Murray during a 2005 rugby trip to Ireland when he was billeted out.
"In 2005 on the Australian Schoolboys tour of UK and Ireland we were billeted out with families in Limerick. The family I was billeted with: the Murrays. I don't think @ConorMurray_9 or I were thinking we'd go on to face each other in test rugby. Great to catch up after the game," Pocock Tweeted.
Meanwhile, the wife of Springboks captain Siya Kolisi has shared two images of the flanker with fellow South African loose forward Schalk Burger – 14 years apart.
The first image shows Kolisi getting an autograph with the Springboks great while the second shows the families of both players enjoying a holiday.