Padraig Harrington says he can go on to more victories in majors after winning his first in the Open at Carnoustie.
Harrington says keeping calm was the key to his Open success
The Irishman told BBC Sport: "Once you've won a few events, everything is about winning a major and the whole of your career is judged on that.
"Winning the first one is the hardest part and there's a lot of pressure, hype and stress about doing it.
"So to finally cross that threshold is such a relief, and hopefully I can now go on and win a few of them."
Harrington, 35, triumphed over Ryder Cup team-mate Sergio Garcia in a four-hole play-off after a double-bogey at Carnoustie's 18th.
"If there ever was a good double bogey six, that was it," he said on Monday.
"The hole is a very tough one, one of the toughest in golf, and I hit a couple of bad shots, but I'm really proud of the way I reacted.
"I kept myself so level, my temperament was so good that I do believe that's what won me the play-off - my reaction to nearly losing the Open [at the 18th]. I stayed very, very calm."
Harrington also credited his win to his Open build-up, which saw him win his fourth Irish PGA Championship title on a links course in County Wicklow.
"I asked the Irish PGA to put the event on a links course the week before the Open," he revealed.
"They did that for me, so I got four rounds of competitive links golf and it definitely made a difference for me at Carnoustie.
"I do believe it would help anyone the week before the Open to play a links course, and competitive links golf is better than just going out there and playing a few practice rounds.
"But I don't think it's going to happen in the very near future unless a lot of European Tour pros start taking their PGA membership in Ireland."