Conversation so far:
did mesut ozil win champions league with real madrid
Although Real Madrid did not win any silverware except for the Supercopa de España, Mesut Özil's performance was praised.
what is notable about Mesut Ozil's soccer performance
Mesut Özil is a versatile midfielder, who excels in an advanced playmaking role, as a winger on either flank, or as an attacking midfielder through the centre of the pitch.
what else is notable about Mesut Ozil's soccer performance
During the 2010 FIFA World Cup, Mesut Ozil was also deployed in a new role which was later described as a false-10 or central winger.
what do people say about Mesut Ozil
Mesut Özil has been called assist-king in the media.

Question: why is he called that
Self-contained rewrite: why is Mesut Ozil called assist king