The leaders are at 20-under par, one shot better than groupmate Harris English, with four holes left to complete Monday. They played a total of 32 holes in a marathon day to make up for losing all of Thursday's round due to rain.
Todd could win back-to-back tournaments if he were to separate himself from the pack Monday morning. He claimed the Bermuda Championship two weeks ago, which ended a five-year winless drought.
Mexican Carlos Ortiz is also a single stroke behind the leaders. The 28-year-old only has one hole remaining in his final round as he searches for his first PGA Tour title.
Round 4 will resume at 7:30 a.m. ET.