A year after doubting he'd ever compete again, surf lifesaving champion Ali Day has won his third Ironman Series with a perfect display.

After going three-from-three in the opening weekend of the series a fortnight ago, Day wrapped up another clean sweep at Kingscliff on Sunday to complete the most dominant display in the championship's history.

It's a long way from 12 months ago when Day was sidelined with two broken wrists and concerned his career may be over.

"There was times last year where I almost thought about just giving it up," Day told AAP.

"I lost so much confidence in myself and I almost felt like throwing it away because I was over it. I was embarrassed and I definitely didn't think I'd get back to where I was.

"But I had some great people around me. I just took it one day at a time and that's kind of led me to where I am now."

Day admits the pressure of chasing a perfect six added an extra element to Sunday's race but he made sure to soak in the moment as he cruised in to the beach knowing the race was won.

"Even yesterday I won a series race, which they're so hard to win, but my first thought was like 'okay let's start getting ready for tomorrow'," Day said.

"So I tried to really cherish it coming in on that last wave. I could see my family on the left there, I knew where Kel, my wife, and Danny (son) were.

"I'm just relieved that it's over now and I can just relax."

Day is promising a break for his young family but has vowed to return to the series next summer to defend his crown.

"So much has gone into it obviously since July 2019 when I first broke my wrists. I don't think I've stopped thinking about it for a day," he said.

"Even Christmas, Christmas Eve, New Year's Eve - I've trained the whole way through just to make sure I was ready.

"I imagine if I'd come back and didn't race very well, I think I probably would have retired, so it's crazy to even think about that now after winning six in a row."

There was also joy for defending women's champion Lana Rogers as she claimed back-to-back titles, with Day himself inspiring her before Sunday's final race.

"Ali Day told me today 'you'll want to win these rounds' and the job wasn't done yet," Rogers said.

"So that's what I stuck with and I was a lot more aware of what was happening in the ocean today so I think that's what won me the race there."