Holger Rune left his Nordic Open match Saturday against Ugo Humbert in tears, later confirming that he had ruptured his Achilles tendon at the end of two of the stranger minutes of the tennis season.

Well, it’s been a month since tennis’s resident bad boy, Holger Rune, took a nasty tumble and ruptured his Achilles tendon during the Stockholm tournament. For a player who thrives on the dramatic, ...