Table schema:
CREATE TABLE table_name_75 (to_par VARCHAR, country VARCHAR, place VARCHAR, score VARCHAR)

Question: What is To Par, when Country is "United States", when Place is "T4", and when Score is "71-68=139"?
SQL: SELECT to_par FROM table_name_75 WHERE country = "united states" AND place = "t4" AND score = 71 - 68 = 139