At the European Athletics Championships, Lewandowski claimed gold in the 800 metres in 2010 and silvers in 2016 and 2018 for the 800 m and 1500 m respectively.

[3][4][5][6] He is a graduate of physical education at the University of Szczecin with a masters dissertation titled "Marcin Lewandowski's 800m distance yearly preparation programme" (Polish: Roczny cykl przygotowań Marcina Lewandowskiego na dystansie 800 metrów).

[12] His first medal of 2010 was a bronze, as he was third behind Yuriy Borzakovskiy and Michael Rimmer at the 2010 European Team Championships.

Lewandowski won the 800 m at the 2010 European Athletics Championships and took the silver medal behind David Rudisha at the 2010 IAAF Continental Cup.

[13] Lewandowski improved his indoor best to 1:46.17 minutes at the Sparkassen Cup in February 2011, coming third.