Aaron Jarvis said winning his first cap for Wales was "amazing" despite finishing on the losing side.
The Ospreys tighthead, deputising for the injured Adam Jones, was one of the few plus points for the Welsh in their 26-12 defeat at home to Argentina.
Exeter-born Jarvis has played for England U16 and U19 but qualifies through a Welsh grandmother.
He was up against the hugely experienced Leicester prop Marcos Ayerza and more than held his own.
"It was absolutely amazing to win my first cap, but I am absolutely gutted at the same time with the result," said Jarvis.
"The physicality, that side of it, was harder, but it was a really enjoyable experience. There were a couple of positive things, and a few things I need to look at going forward.
"I knew it would be a step up, so I don't think that was a surprise. Everything is that bit quicker and that bit more physical."
"It has been an unbelievable couple of weeks. I struggle to put it into words, really. I wanted to try and play as much rugby for the Ospreys as I could this season, and then see what happens.
"Luckily, I had a run of games, and then I was over the moon when I got called up for the squad.
"It has been a great experience. I've got to keep working hard, and hopefully I will continue to be involved."