RIO DE JANEIRO - National swimmer Quah Zheng Wen rebounded from a disappointing 100m backstroke swim on Sunday to qualify for the 200m butterfly semi-finals on Monday.
The 19-year-old clocked 1:56:01 in heats 2 to finish among the top 16 competitors at the Olympic Aquatics Stadium in Rio.
He was 10th fastest of the 29 participants.
"I'm happy with how the race turned out," Quah said. "I'm in my first Olympic semi-finals so I'm pretty excited about that."
He added: "I went hard and think I could have gone faster. I definitely have to go faster in the semis. A lot of the big names probably didn't try their hardest so it's going to be a dog fight."
His previous personal 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 had finished a disappointing 22nd in the heats of the men's 100m backstroke event on Sunday.
He clocked 54.38 seconds, which was 0.35 seconds slower than his personal best and national record of 54.03 seconds.
The 200m fly semi-final is late Monday night in Rio (Tuesday morning Singapore time).