Dustin Johnson and Emiliano Grillo grabbed a share of the clubhouse lead before thunderstorms saw play suspended at the RBC Heritage.
The world No 1 carded a four-under 67 on Friday morning to get to seven under alongside Grillo, who fired an albatross on his way to matching Johnson's total.
Despite tee times being brought forward to get as play in as possible, only 42 players finished their second rounds before play was suspended at 12.48pm local time (5.48pm BST).
"It was difficult all day," Johnson said. "The wind blew consistently all day and made it tough. I hit a lot of really solid golf shots. At times it was really difficult to judge the wind but I felt like I played really solid all day, gave myself a lot of opportunities.
Overnight leader Shane Lowry made a fast start to his round to move into top spot when play was halted, following his opening-round 65 with birdies on his first two holes to get to eight under.
Lowry fired his approach at the first to tap-in range and made a two-putt birdie from 95 feet at the next, with the Irishman on the third green in regulation when play resumes at 4.30pm UK time (9.30pm BST).