RIO DE JANEIRO - National swimmer Quah Zheng Wen finished 10th overall in the 200m butterfly event at the Rio Olympics on Monday night and did not advance to the next day's final.
The 19-year-old, who is Singapore's first male Olympic semi-finalist, clocked 1min 56.11sec in the first semis.
Hungary's Tamas Kenderesi was the fastest swimmer in 1:53.96 while Belgium Louis Croenen was eighth in 1.56.03.
Only the top eight progress to the final.
Quah had swam 1:56.01 in the afternoon heats, which was also a new personal best for him.
His previous best was 1:56.26 while Singapore's national record is 1:55.73, set by Joseph Schooling at last year's SEA Games on home soil.
Quah's next event is the 100m butterfly on Thursday afternoon in Rio.