He is currently tied with Oskar Eriksson in first place on the WCF-recognized list of championship medals, with thirty-eight in total.

[6] He reached the playoffs in forty-five Grand Slam of Curling events and won the Pinty's Cup with his current teammates, Oskar Eriksson, Rasmus Wranå, and Christopher Sundgren.

[10] He started curling in 1999, inspired in part by the Swedish women's team skipped by Elisabet Gustafson when they secured the bronze medal at the 1998 Winter Olympics.

The following year, Edin was selected as the alternate for the silver medal-winning Swedish team skipped by Nils Carlsén at the World Junior Curling Championships.

Edin also skipped a new team in 2005 to a silver medal at the European Mixed Curling Championships, together with future longtime teammate Sebastian Kraupp.

In 2006, Edin won a second silver medal at the World Junior Curling Championships, this time playing third for Team Carlsén.

In 2008, Edin also skipped yet another team to the bronze medal at the 2008 European Mixed Curling Championships, with Anna Hasselborg playing third.

[16] On the World Curling Tour, the team also started strongly by winning the Oslo Cup and making the finals of the Baden Masters.

Their biggest success came by peaking when it counted in the international championships, taking two important gold medals in the same season.

They achieved their best success reaching the semifinals of the Shorty Jenkins Classic, beating Kevin Martin in the quarterfinals.

At the 2014 Winter Olympics, Sweden finished in first place after the round-robin, with an 8–1 record but lost a tight match to the Great Britain team skipped by David Murdoch in the semi-final.

[21] At the end of the season, the team formally announced that they were disbanding, with Niklas Edin eager to continue, but with Sebastian Kraupp and Fredrik Lindberg concerned about their ability to train and compete as necessary to reach the top of the World Curling Tour rankings while focusing on their future careers.

While the team lost three round-robin games, they rallied in the playoffs defeating Finland, Canada, and then their Norwegian rivals again to pick up the championship.

The victory meant that Edin and Eriksson held the gold medals at the European and World Championships for the second time in a single curling season.

That season, the team also reached their second career Grand Slam final, losing in the inaugural Elite 10 event.

The team became increasingly competitive, however, at the Grand Slams, reaching the playoffs in the Masters, the Canadian Open, Players' Championship, and the Champions Cup.

[25] At the end of the season, Lindström was forced to take a break from curling, requiring a shoulder operation and needing recovery.

They again represented Sweden at the 2019 World Men's Curling Championship, winning the gold medal over Team Canada's Kevin Koe.

They then reached the bronze medal position at the Swiss Cup Basel,[33] and made the playoffs at the 2019 Tour Challenge before losing to Team Brad Gushue in the quarters.

The team also reached the quarterfinals in the Euro Super Series, as well as at the Masters and the National in the Grand Slam of Curling.

The team wrapped up the season by coming in second place in the finals of the 2022 Players' Championship and reaching the semifinals of the 2022 Champions Cup.

The season started with Team Edin failing to make the playoffs in the Baden Masters, but then rallied to win the Oslo Cup and the Stu Sells Toronto Tankard.

Eriksson, Sundgren, and Wranå competed under the Edin banner for the team's next two events, winning the Western Showdown and reaching the semifinals of the Penticton Curling Classic.

[40] The team found success with Edin back in the lineup, making it as far as the finals in the Canadian Open, before losing to Brendan Bottcher's rink.

They were eliminated by Canada in the qualification playoff game, ending their reign as World Champions for four years running.

[42] Down by two in the tenth end, Edin had to throw a rock with an incredible amount of spin, making it curl enough to bump a guarded corner-frozen Norwegian stone at the perfect angle to avoid moving the Swedish rock it was frozen to, while also moving the Norwegian stone far enough to score two.

As a result, Edin began to participate in the Swedish Mixed Doubles Curling Championships, placing 4th in 2019,[46] but missing the playoffs in 2020.

Edin also currently holds several records with his teammates Eriksson, Sundgren, and Wranå, who formed the team that won four gold medals between 2018 and 2022.

[51] In 2019, Edin, together with his teammates Eriksson and Sundgren, also became the first men's curlers to hold these same titles simultaneously in two separate calendar years (2015 and 2019).

[52] Edin, Eriksson, and Sundgren are also the first curlers in history on the men's side to win four European Championship gold medals in a row (2014–2017).