Here are O'Brien's three top picks. Who would make your team of the tournament?
IZHARULHAQ NAVEED – AFGHANISTAN
"Being a leg-spinner is such a difficult art, and when you’re following in the footsteps of the likes of Rashid Khan coming out of Afghanistan, there’s an awful lot of media speculation and hype around you.
"Everyone’s talking about this next leg-spinner, the next Rashid Khan, the next Qais Ahmad. So I’m going to go for Naveed, I think he’s a beautiful player."
REUBEN WILSON – IRELAND
"Fifteen years of age, out of Ireland, still at school, available for two more U19 Men’s World Cups; Reuben Wilson didn’t play in the first game, but came in and did a great job with the new ball. He’s tall, he’s athletic, and he’s only 15 so he’s back to school now next week or so.
"He’s a lovely little player, good seamer, no great pace but I think when he gets a bit stronger, a bit fitter and a bit more exposure to this level, I think Reuben Wilson’s going to be an absolute star for Ireland at the senior level, probably sooner than we might think."
RAJ BAWA – INDIA
"I think he’s an absolute cracker. An unbeaten 150-odd against Uganda, top class. You come out of India to these tournaments and there’s so much hype around you. People say he plays a lot like Shikhar Dhawan.
"I think this Bawa is a batter, but he’s also a very good bowler. So I think he’s someone who’s going to play for India in the very near future.
"He’s a very good player on the leg side, loves a pick-up pull shot, clean striker, good hitter of the ball, and he can bowl… and I love left-handers."