Olympic debutant Nhat Nguyen has won his first Group F match at Tokyo 2020.
The Dubliner beat Nikula Karunaratne of Sri Lanka in two sets - 21-16 - 21-14.
Nguyen will face Wang Tzu-Wei from Chinese Taipei in his second group match on Wednesday.
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The Ireland Sevens team will have to win their final pool game at the Olympics to have any chance of reaching the quarter-finals in Tokyo.
Ireland were beaten 19-17 by the USA in their second Pool C game to follow the defeat to South Africa earlier today.
Anthony Eddy's side can still qualify as one of the best third-placed sides.
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In swimming, Brendan Hyland finished third in his heat of the Men's 200 metre butterfly but 23rd overall.
His time of 1 minute 57.09 seconds was his second fastest ever and half a second behind the Irish record.
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Ellen Walshe posted 2 minutes and 13.34 seconds from Lane 1 in her 200 metre Individual Medley heat.
The 19-year-old Dubliner improved on her pre-meet ranking of 20th to finish 19th overall.
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Earlier on, Mona McSharry qualified for tomorrow's final of the 100metre breaststroke with a fourth place finish in her semi final
The 20 year-old from Sligo qualified in eighth overall
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There was disappointment for boxers Michaela Walsh and Brendan Irvine.
Walsh bowed out in the last 16 of the featherweight division, going down to Italy's Irma Testa on a unanimous decision
Irvine was beaten by Carlo Paalam of the Philippines in the last 32 of the men's flyweight division.
The Belfast boxer was on the wrong end of a 4-1 split decision.
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In sailing, Annalise Murphy is 32nd overall after four races of the Laser Radial competition
The silver medalist in Rio finished in 24th and 37th repectively in races 3 and 4.
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Liam Jegou missed out on a place in the final of the canoe slalom - he finished last of 15 in the semi-finals after he was penalised for missing two gates.
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In hockey, the Ireland women's team were beaten 4-nil by the Netherlands in their second match of the tournament.
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Ireland's Russell White finished 48th in the Triathlon final, 9 minutes and 36 seconds behind the winner Kristian Blummenfelt of Norway.
