John Cook shrugged off the disappointment of Sunday’s play-off defeat in the Senior Open Championship presented by MasterCard by taking the early clubhouse lead in the US Senior Open.
Cook shot a four under par 66 at The Boradmoor to lead Eduardo Romero by a shot as the Argentine led the European Seniors Tour challenge. Marris Hatalsky was also on three under par.
"I didn't like the way it finished last week at all," said Cook, who let a lead slip and lost on the first sudden death play-off hole to Bruce Vaughan. "Second is not good.
"This week, I had a nice practice round, and once I decided that this week has started now and it's a different week, different tournament, another Major Championship, I can put that last week behind me until I get home next week."
Romero, who led after the first round in the US Senior Open Championship last year and finished third last week at Royal Troon, said: "My mind is completely open now. Since my victory in New York (on the US Champions Tour), I'm a different guy.
"My game is completely different. My putter is working now. Last year my putter was not so good. but now it's working nice and I'm feeling a lot of confidence."
The morning wave featured five players at level 70, the most notable being Greg Norman, who contended until late on Sunday at The Open at Royal Birkdale before settling for a third-place tie two weeks ago. Last week, he tied for fifth at Royal Troon.