The BMW Championship will go into a fifth day after Sunday's play was abandoned due to bad weather.
Only six players were able to complete their rain-delayed final rounds when further downpours forced play to be called off.
Twenty-two players, including the leaders, failed to get out of the clubhouse in Illinois.
Leader Jim Furyk will defend a one-shot advantage when he begins his fourth round on Monday.
Northern Ireland's Rory McIlroy was one of the few finishers, carding a final round of 68 to finish seven over par.
Englishman Lee Westwood, who has been struggling with back and neck pain, scored 74 to end the tournament 12 over par.