Australian flyweight Alex Winwood has suffered a split-decision loss to Zambia's Patrick Chinyemba in his first boxing bout at the Tokyo Olympics.
Thai judge Karn Naklam deemed Winwood the winner after three tight rounds at the Kokugikan Arena.
But the remaining four judges gave the victory to Chinyemba, whose fancy footwork and reach helped secure a spot in the round of 16.
Chinyemba was adjudicated a 29-28 winner on three scorecards, while that was the same margin that Naklam settled on.
Winwood rallied after being outgunned in the opening round, winning the second round in the eyes of all but one judge.
But the 24-year-old West Australian failed to land enough blows to achieve the same result in the deciding round.
Australian featherweight Skye Nicolson, who had an opening round bye, will fight South Korean Aeji Im later on Monday.
