Career
He challenged seven other swimmers on the fourth heat, including British-born Paraguayan swimmer Benjamin Hockin. Kalniņš raced to second place, and dipped under a 50-second barrier by a quarter of a second (025) behind Turkey"s Kemal Arda Gürdal, in his personal best of 49.96. Kalniņš failed to advance into the semifinals, as he placed thirtieth overall in the preliminaries.
At the 2013 World Aquatics Championships in Barcelona, Kalniņš competed in the 100 and 200 m freestyle but failed to advance past the heats, finishing with times of 50.51 and 1:51.91 respectfully.