In 1998, McEwen won his first of two Manitoba Junior championships, sending him and his team of David Chalmers, Bryce Granger and Kevin Schmidt to the 1998 Canadian Junior Curling Championships. There, he led his Manitoba rink to 9-3 round robin record, in 2nd place. This put the team in a semifinal match up against Ontario's John Morris. McEwen would lose the match 8–4, settling for third place.[3]
Three years later, McEwen and his new team of Denni Neufeld, Geordie Hargreaves and Nolan Thiessen won the Manitoba junior championships again, qualifying them to represent Manitoba at the 2001 Canadian Juniors. There, they finished in 3rd place after the round robin, with a 9–3 record. This put the team into the semifinals against Northern Ontario's Brian Adams. McEwen beat Adams 8–3, qualifying for the final against Newfoundland's Brad Gushue. McEwen and his Manitoba rink would lose to Gushue, by a score of 8–3, placing them in 2nd place.[4]
In 2003, McEwen and teammates Denni Neufeld, Sheldon Wettig, Marc Kennedy and Nolan Thiessen represented Canada at the 2003 Winter Universiade. McEwen and Wettig represented Brandon University, while his teammates represented the University of Manitoba (Neufeld and Thiessen) and the University of Alberta (Kennedy) . The team finished the round robin with a 6–3 record, in third place. The team then went on to beat Great Britain's Paul Stevenson in the semi-final, then Switzerland's Cyril Stutz in the final, to claim the gold medal.[5]
For the 2006–07 season, Richter and Melnuk left the team and were replaced with Geordie Hargreaves and Adam Guenther. The team disbanded after just one season together.
2007-2010
McEwen formed a new rink once again of brothers Denni and B. J. Neufeld and Matt Wozniak in 2007. In their first season together, they were a semi-finalist at the 2008 Safeway Championship, Manitoba's provincial championship. Their first Grand Slam event as a team was at the end season, at the 2008 Players' Championships. The team won two games, before being eliminated.
At the conclusion of the 2008–09 season the McEwen team was ranked 7th on the CCA rankings. They had made it to three Grand Slam playoffs, and finished 4th at the 2009 Safeway Championship.
McEwen's rink made it to his first provincial final in 2010, when he lost to Jeff Stoughton in the 2010 Manitoba provincial final. The game was being played in Steinbach, Manitoba and as the Neufeld brothers and their father have roots in Steinbach, were treated very much as the home team and crowd favourites.[7]
2010-2015: Grand Slam success and perennial provincial runner-up
McEwen started the 2010–11 season off well by defeating provincial rival Jeff Stoughton to win the World Cup of Curling and his first ever Grand Slam title in November, 2010.[8] In part of the teams runner-up result in the provincial finals of 2010 and in part because of his 4 victories (2010 Canad Inns Prairie Classic, 2010 Sun Life Classic, 2010 Challenge Casino de Charlevoix and 2011 Ramada Perth Masters), and leading the overall money winnings in the World Curling Tour season as of November 2010, the McEwen team was named as a nominee for the provincial team of the year by the Manitoba Sportswriters and Sportscasters Association.[9]
The team continued their strong season that year by defeating provincial rival Stoughton in the semi-final of the 2011 Canadian Open. McEwen would then go on to beat the Glenn Howard team in the extra end of the final, thus winning their second career Grand Slam and their second of that season.[10]
In 2017 McEwen would defend his Manitoba Championship by beating Reid Carruthers in the final of the 2017 Viterra Championship. At the 2017 Tim Hortons Brier, he would then better his 2016 Brier showing, going 9–2 in the round robin to enter the playoffs in 1st place and with hammer and choice of rocks (Brad Gushue would also be 9-2 but would lose 1st place due to losing his round robin meeting with Mike). He would fall 7–5 to Brad Gushue in the 1–2 game however. In the semi-finals against reigning Brier and World Champion Kevin Koe he was in control almost the whole way but up 5–3 with hammer in the 8th end Koe would make an incredible comeback with a steal in the 8th, a two in the 10th, and another steal in the extra end, dropping Mike to the bronze medal game. Mike would recover from this disappointment to win his first Brier medal, defeating Brad Jacobs in their rematch of the 2016 bronze medal game, 7–6 in an extra end. On the tour that season, the team won just two events, the 2016 DeKalb Superspiel and the 2017 Ed Werenich Golden Wrench Classic. The team won the Golden Wrench Classic the following year as well.
While competing at the 2018 Viterra Championship McEwen came down with chickenpox and was unable to play after the first game. B. J. Neufeld skipped the team, until a surprise appearance by McEwen in the final where they would lose to Carruthers.[16] Despite the setback, McEwen still had a chance to qualify for the 2018 Tim Hortons Brier through the wildcard game, which he won over Jason Gunnlaugson. McEwen had a difficult Brier and alongside Carruthers was unable to qualify for the playoffs.[17] Following the disappointment at the Brier the McEwen team announced they would be breaking up at the end of the 2017–18 season.[18] Just days after the announcement the McEwen team won the 2018 Elite 10 Grand Slam of Curling event, winning the top $28,000 prize money, and was the first team to go through the entire event undefeated.[19] The Grand Slam victory was the team's seventh overall. Shortly after the event it was announced that McEwen would join his friend, Reid Carruthers, on his team throwing the fourth rocks, while Carruthers would continue to skip the team.[20][21]
Team McEwen had a more successful following season. On the tour, they never missed the playoffs and they won one event, the inaugural WCT Uiseong International Curling Cup. In Grand Slam play, they reached the quarterfinals of the Tour Challenge and the National and the semifinals of the Canadian Open. They would not defend their provincial title, losing the final of the 2020 Viterra Championship to Jason Gunnlaugson. They would still compete at the 2020 Tim Hortons Brier though, winning the Wild Card spot over Glenn Howard in the play-in game. Team McEwen finished the round robin and championship pool with a 7–4 record, which was a four-way tie for fourth. They faced John Epping in the first round of tiebreakers where they lost 8–5 and were eliminated. It would be the team's last event of the season as both the Players' Championship and the Champions Cup Grand Slam events were cancelled due to the COVID-19 pandemic.[22]