An Byeong-hun carded a five-under 65 to grab the outright lead at the Wyndham Championship.
Tony Finau carded a six-under 64 to grab the first-round lead at the Charles Schwab Challenge.
Jordan Spieth and Sung Kang shared the lead during a rain-affected opening round at the Genesis Open.
Denmark claimed their first World Cup of Golf title thanks to Thorbjorn Olesen and Soren Kjeldsen.
Soren Kjeldsen and Thorbjorn Olesen carded a 70 to increase Denmark's overnight lead by one stroke at Kingston Heath Golf Club.