Answer: usopens

AnswerCrossword Clue
USOPENSMajor golf or tennis events
USOPENSMajor tourneys
USOPENSFour of Nicklaus' victories
USOPENSNicklaus won four of them
USOPENSFour of Ben Hogan's titles
USOPENSSports biggies
USOPENSGrand Slam tennis events