Tokyo Olympics: Lisa Carrington, Caitlin Regal back up from K2 500 gold to reach K1 500 semi-finals

Lisa Carrington and Caitlin Regal have backed up from their gold medal in the canoe sprint K2 500 on Tuesday, both reaching the semi-finals of the K1 500 at Tokyo's Sea Forest Waterway.

On Tuesday, Carrington claimed her third and fourth Olympic gold medals, winning her third consecutive K1 200 title, and adding the K2 500 with Regal not long after.

And backing up as part of a gruelling schedule in contention for four golds from the Tokyo Olympics, Carrington returned to Sea Forest Waterway, less than 24 hours from her most recent triumph.

But if there was any fatigue from two gold medal wins on Tuesday, Carrington didn't show it.

The 32-year-old led her heat from start to finish, taking out first place with a time of 1m 48.463s, and booked her spot in tomorrow's semi-final.

Carrington needs one more gold medal to overtake Ian Ferguson as New Zealand's most successful Olympian, with a chance to add either the K1 500 or K4 500 to her collection.

Regal, 29, also advanced to the semi-final, finishing third in her heat behind Sweden's Linnea Stensils and Australia's Alyce Wood, with the top three advancing.

The women's K1 500 semi-finals begin at 12:58pm Thursday.

In the men's K2 1000, the Kiwi pair of Max Brown and Curtis Imrie could only manage a fourth placed finish in their heat, and instead had to qualify through a quarter-final.

Needing a top three finish, Brown and Imrie secured second place with a New Zealand record time, to advance to tomorrow's semi-final, along with Belarus and Italy.

The men's K2 1000 semi-finals begin at 1:26pm Thursday.