The third round of the weather-delayed AT&T Byron Nelson got underway at the TPC Four Seasons Resort in Irving, Texas after 33 players completed their second round early on Saturday.
Americans Jimmy Walker and Jon Curran, and Australian Steven Bowditch shared the 36-hole lead at nine under par, one stroke better than Australian Cameron Percy and Americans Ryan Palmer, Tony Finau and Joe Affrunti.
Three shots off the pace was Masters champion Jordan Spieth.
Heavy rains disrupted the opening two rounds at the PGA Tour event, but with players teeing off in threesomes and improved weather in the forecast, officials were hopeful of completing the third round.