Career
He is a 2000 Olympian and a three-time Belarusian record holder in the 400, 800, and 1500 m freestyle. Koptur competed in three swimming events at the 2000 Summer Olympics in Sydney. He cleared a FINA A-standard entry time of 15:27.86 (400 m freestyle) from the European Championships in Helsinki, Finland.
On the first day of the Games, Koptur placed twenty-second in the 400 m freestyle.
Four days later, Koptur teamed up with Pavel Lagoun, Igor Koleda, and Valeryan Khuroshvili in the 4×200 m freestyle relay. Swimming the third leg, Koptur recorded a split of 1:51.14, but the Belarusians fell short to sixth place and twelfth overall in a final time of 7:24.83.
In his final event, 1500 m freestyle, Koptur challenged seven other swimmers in heat three, including top favorites Ricardo Monasterio of Venezuela and Spyridon Gianniotis of Greece. He held off Gianniotis by seven hundredths of a second (007) to earn a second spot in a time of 15:29.62.
