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After a first successful defense of the belt in a bout againts Mexican Ruben Padilla , he lost the second defense , suffering his 2nd professional defeat in a 2 round stoppage loss to world title contender and knockout artist Adonis " Superman " Stevenson in Montreal , Canada .
 Adonis " Superman " Stevenson, Montreal, Canada
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Adonis " Superman " Stevenson, Montreal, Canada