SILVIS, Ill. — It’s a short hike from T.P.C. Deere Run’s ninth green to the 10th tee, and Nate Lashley, who was playing in his third tournament in three weeks, was dragging. Lashley paused to greet an octogenarian friend who was following his first round at the John Deere Classic last Thursday, and said, “I should have taken this week off.”

Lashley had been playing nonstop since the last week of June, when he won for the first time on the PGA Tour, in wire-to-wire fashion in Detroit, in his 33rd tour start since turning professional in 2005.

“I had so much adrenaline after Detroit, I figured it could carry me through,” Lashley said, laughing at his logic. “But it ran out pretty fast. I think I’m in my 20s again and I forget I’m 36 years old.”

Lashley has raised his game after many years meandering through small-town America and PGA Tour Latinoamérica. In the autumn of his career, he is preparing for his first British Open, starting Thursday at Northern Ireland’s Royal Portrush Golf Club, a significant step up from the Opens in Utah, Iowa, Wyoming and Colorado that once anchored his schedule.