Jordan Spieth, 2017 @TheOpen champion at Royal Birkdale, has spent 26 weeks at world No. 1, most recently in 2016.
At age 32, Spieth believes he has ample runway to regain peak form.
"There are things I can do now that I can do significantly better than I could when I was No. 1 in the world," Spieth said Monday at Royal Birkdale. "Therefore, there should be nothing to stop me in my own head to be able to search and believe that I can reach that again.
"I'm 32; I'm not 42. At 42 you'd really have to sacrifice a lot of things to try and do that. I don't feel like I have to."
Spieth enters The Open at No. 51 on the Official World Golf Ranking.
Can he eventually return to world No. 1?