Swimmer Kregor Zirk finished 25th in the 200 m butterfly stroke at the Tokyo Olympics with a time of 1.57,26.
Zirk would have had to swim close to his personal record (1.56,63) to reach the semi-finals.
The Estonian participated in the 200 m freestyle semi-finals earlier on Monday, in which he finished 13th overall and did not make the finals.
The fastest swimmer in the preliminaries was Hungarian Kristof Milak with a time of 1.53,58. The final swimmer to reach the semi-finals was South African Chad le Clos, who finished 2,38 seconds behind Milak.
Editor: Kristjan Kallaste