Holes 10 through 18 on an 18-hole golf course.
The back nine refers to the second half of a standard 18-hole round. The term originated from traditional course routing where the first nine holes went out from the clubhouse and the back nine returned. In tournament play, the back nine often determines the outcome as pressure builds on the closing stretch. The phrase 'back nine Sunday' is synonymous with crunch time in professional golf.

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