He also won one of the bronze medals in the men's kumite 60 kg event at the 2010 World Karate Championships held in Belgrade, Serbia.

[2] Kalniņš won one of the bronze medals in the men's kumite 60 kg event at the 2010 World Karate Championships held in Belgrade.

In 2019, Kalniņš won the gold medal in the men's kumite 60 kg event at the European Games held in Minsk, Belarus.

[3] In May 2021, Kalniņš won the silver medal in his event at the European Karate Championships in Poreč, Croatia.

[7] He competed in the men's kumite 60 kg event at the 2022 World Games held in Birmingham, Alabama.