Jacobs, the Sochi 2014 Olympic gold medallist, skipped his team to a 6-5 victory over John Epping in the men's final at Yorkton's Gallagher Centre.

Pyeongchang 2018 Olympic champion Hasselborg needed an extra end in the women's final before recording a 7-5 victory against South Korea's Min-Jim Kim.

Both Jacobs and Hasselborg also won the last two Grand Slam of Curling events on the circuit, the Tour Challenge and National.

The men's final looked set to be a one-sided affair as Jacobs opened up a 5-1 lead, but Epping scored two points in both the sixth and seventh ends to draw level.

He could not complete the comeback as Jacobs scored a point with the hammer in the final end.

Only his fellow Canadians Kevin Martin, Glenn Howard and Brendan Bottcher have won three Grand Slam of Curling titles in a row before.

"It put us into a pretty elite group of athletes who have accomplished three in a row, so it's really special," said Jacobs, who guided his team to a perfect record of six victories throughout the tournament and now boasts seven Grand Slam titles in all.

"A win's a win and it doesn't always have to be pretty."

Ryan Harnden, E.J. Harnden and Marc Kennedy were also part of the Jacobs line-up.

Canada's Rachel Homan is the only other women's skip to win three consecutive Grand Slams.

Hasselborg, who was playing while pregnant, sealed today's final with an open hit in the extra end.

She now has five Grand Slam wins in her career and was playing with Sara McManus, Agnes Knochenhauer and Sofia Mabergs.

"To be honest, we struggled this week but what is cool with this team is we find a way to just back up each other and pull out some really great wins," the Swede said.

"I'm really, really proud of the team effort this week and really proud of how we are putting the play-offs together."