Conversation so far:
What was Björn Borg recognized for?
Björn Rune Borg is a Swedish former world No. 1 tennis player widely considered to be one of the greatest players in the history of the sport
How did Björn Borg compare to other players?
Björn Borg is considered to have been the No. 1 player in the world for 1977, 1978, and 1980.
What did others think of Björn Borg?
A teenage sensation at the start of his career, Björn Borg's unprecedented stardom and consistent success helped propel the rising popularity of tennis during the 1970s.

Question: Did Borg face any difficulties or failures?
Self-contained rewrite: Did Björn Borg face any difficulties or failures?