Nhat Nguyen has beaten Nikula Karunaratne of Sri Lanka 21-16, 21-14 to win his opening match at the Olympics in Toyko.

Nguyen was always in charge on his Games debut and established a 5-1 lead early on in the Group F match.

Karunaratne offered some resistance, but many of his points came from errors by the Irish player.

The second set was even more comfortable and while Nguyen's victory was delayed as he misjudged two of the closing points to be out of the court, he went on to claim a comfortable straight sets win.

The 20-year-old will now play number 10 seed Wang Tzu Wei on Wednesday, which will decide if he progresses to the last 16.

Nguyen dedicated the win to his family, particularly his parents who are cheering him on from home.

"They have sacrificed a lot for me and my sister and I am happy to give back by giving them something to cheer about and something to be happy about," he said. "I am going to give them a call after this game and I am happy that I made them proud."

Speaking to RTÉ Sport after his win today, Nguyen said he was happy with his performance.

"I just want to thank all the team members, staff and coaches up there supporting me," he said. "I think that was a good boost. I was a bit nervous coming out but once I heard that support, it was overwhelming."

He said he will face a "tough" test against the number 10 seed on Wednesday, but was hoping to bring the same energy to that performance.