While performing in England, Castagnoli received training from Dave Taylor. Claudio met Chris Hero in Germany. Hero invited the SMH to perform in America. They had matches in IWA-Mid South and CHIKARA and received training from Hero before returning to Europe.
Claudio Castagnoli would also make his way to Combat Zone Wrestling, where he would team up with Chris Hero to form the highly successful Kings of Wrestling, and would win the CZW Tag Team Titles. With Hero, Castagnoli won the Tag World Grand Prix 2006 hosted by CHIKARA, becoming one of Los Campeones de Parejas in the process.
In August 2005, CHIKARA claimed that Claudio Castagnoli set the all-time record for holding an opponent up in a vertical suplex with 70 seconds. They claim he broke the record set by Kenta Kobashi of 54 seconds, which happened in Japan.
Claudio's finisher, the Ricola Bomb takes its name from Ricola, a famous Swiss cough drop.