Ireland's Seamus Power is just two shots off the lead in the PGA Tour's AT&T Byron Nelson Championship after a stunning round of 65 in Texas.
Power, is two shots off the leader JJ Spaun.
Padraig Harrington is also going strong, posting a six-under par round of 66.
The strong start has the Ryder Cup captain well in contention heading into the second round.
Spain's Rafa Cabrera-Bello is one of three players just a single stroke off the American leader.