Pearson Cup

From 1978 to 1986, the Cup was awarded after a one-game exhibition, that had no effect on the major league standings. The 1979 and 1985 games were abandoned as ties due to time constraints; in 1979 the Expos had to catch an airplane flight,^[4] while in 1985 the Jays had to catch a flight.^[5][6]

The game was suspended in 1987 as the two teams could not find a mutually agreeable date to play the game.^[7] There was discussion about reviving the game in the preseason, or playing it in another Canadian city such as Vancouver, but this never took place.^[8][9][10]

During the 2003 and 2004 series, the Cup was awarded after a six-game set, three in Toronto and three in Montreal.^[3] These games counted in major-league standings and were played during the regular season.

The Blue Jays and Expos first played meaningful baseball in the 1997 season with the introduction of interleague play, with the teams being designated natural rivals.^[20] In 1997, the teams played three games at Toronto; the two teams played home and home series for the first time in 1998. The series was a decided boost to the paltry attendance numbers at Olympic Stadium in Montreal, and gave a modest increase in attendance at SkyDome in Toronto; it failed, however, to become a serious rivalry amongst the players or the fans.^[1] Some people attribute this to a lack of Canadian players on both teams, while others point to the general discontent of Canadians with Major League Baseball during the late 1990s and early 2000s.^[1][21]

Major League Baseball put the final nail in the Series' coffin by playing the final set between the Jays and Expos in San Juan, Puerto Rico instead of Montreal. Major League Baseball's intention to boost attendance by playing in San Juan ended up resulting in lower attendance than the series had attracted in Montreal a year earlier.^[22][23][24]

The All-Canadian Series ended after 2004 when the Expos were relocated and became known as the Washington Nationals.^[25][26] The Blue Jays won the series 24 games to 19 games, and Toronto also won the most season series (3–2–2).^[27]

The two teams met annually from 1997 to 2004 as part of the All-Canadian Series, then met annually again starting in 2023 as a result of the scheduling formula change, meeting intermittently from 2005 to 2022.^[28]

• Canadian Bill Atkinson was the winning pitcher and scored the winning run for the Expos in the first-ever Pearson Cup game at the Olympic Stadium in 1978.^{[citation needed]}
• Pedro Martínez was the winning pitcher on June 30, 1997, in the first game of 'The All-Canadian Series', pitching 9 innings, striking out 10, walking one.^[30]

• Interleague play
• Canadiens–Maple Leafs rivalry
• 401 derby
• Major League Baseball rivalries
• Beltway Series, the rivalry series currently played by the Nationals after moving from Montreal to Washington.