Straka, who’s chasing his first win on the PGA Tour, completed with 5 birdies on the Innisbrook Golf and Spa resort in Florida.
A variety of prime gamers took the week off following the celebrated Gamers Championship, however the occasion nonetheless contains Jason Day, Patrick Reed, Dustin Johnson and Bubba Watson.
Russell Knox, Kevin Kisner and Luke Donald are tied for third at 4 beneath par and American Keegan Bradley is a part of a five-player group at three beneath 68, two strokes again of the leaders.
Johnson, Watson and Jim Furyk are tied for 11th and nonetheless nicely inside hanging distance after opening with a two-under 69.
“I performed a bit of bit higher than my rating,” Johnson mentioned. “However first time being right here shortly, not actual used to the golf course. It was a very good rating.”
Like Straka, Dahmen has but to win on the Tour. He rolled in six birdies and only one bogey. He’s coming of a tie for 12th at The Gamers.
American Dahmen already had a prime 10 end this season when he tied for ninth on the Farmers two months in the past.
Straka’s greatest end of the season was a tie for 13th on the identical occasion.
Knox had one of many extra entertaining rounds by making an albatross on the par-five 11th after taking a double bogey two holes earlier.
“It is a great way to go from plus two to minus one in a short time,” Knox mentioned. “Did not even should putt, which was nice.”
Defending champion Paul Casey opened with a 70, whereas Jon Rahm made his match debut with an even-par 71.
Early tee occasions did not assist Reed, who had a 77, or Day at 74.
Main scores after the primary spherical of the PGA Tour’s Valspar Championship at Palm Harbor, Florida (USA except famous, par 71):
66 – Joel Dahmen, Sepp Straka (AUT)
67 – Russell Knox (SCO), Kevin Kisner, Luke Donald (ENG)
68 – Shawn Stefani, Brian Stuard, Keegan Bradley, Denny McCarthy, Roberto Castro
69 – Peter Malnati, Tyrrell Hatton (ENG), Harold Varner, Russell Henley, Charley Hoffman, Joaquin Niemann (CHI), Jason Kokrak, Kelly Kraft, Sam Burns, Hank Lebioda, Julin Etulain (ARG), Scott Stallings, Dustin Johnson, Bubba Watson, Jim Furyk, Austin Prepare dinner, Danny Willett (ENG), Roberto Diaz (MEX)