The Seattle Mariners began play as an expansion team in 1977. They've faced the Cubs two times in interleague play in 2002 and 2007.
 The Cubs' Record versus Franchise
 Transactions Involving the Chicago Cubs
(Format is players sent to Cubs followed by players received by this franchise in reverse chronological order)
December 18th: Traded RHP Carlos Silva and $9M for OF/DH Milton Bradley.
January 29th: Traded RHP Aaron Heilman for SS Ronny Cedeno and LHP Garrett Olson.
July: Received SS Joe Simokaitis(minors) from Cubs for future considerations.
June 18: Purchased LHP Mark Watson from the Cubs.
July 6: OF Glenallen Hill selected off waivers by the Chicago Cubs.
July 7: Selected OF Kevin Roberson off waivers from the Chicago Cubs.
July 11: Traded LHP Dave Hartnett (minors) for OF Gary Matthews.
December 9: Traded RHP Rich Bordi for OF Steve Henderson.
April 1: Sold 3B Lenny Randle to the Cubs.
March 20: Traded OF Puchy Delgado for C Larry Cox.
October 25: Traded C Larry Cox for LHP Steve Hamrick.
April 20: Traded RHP Pete Broberg for a player to be named later. The Cubs sent RHP Jim Todd over on October 25th, 1977 to complete the deal.
 Rumored Deals Involving Chicago Cubs
 Players that Played for Both Major League Franchises
55 players including 31 pitchers have played for both the Cubs and Mariners major league franchises through the 2009 season.
 External Links
Baseball Reference Team History 
- ↑ Rogers, Phil. "Cubs hope Kosuke Fukudome gets good start—in Japan". Chicago Tribune. February 2009. http://www.chicagotribune.com/sports/baseball/cubs/chi-19-rogers-kosuke-fukudome-cufeb19,0,1558196.column
- ↑ "Players who played for Chicago Cubs and Seattle Mariners" Baseball-Reference.com http://www.baseball-reference.com/friv/multifranchise.cgi?level=franch&t1=CHC&t2=SEA&t3=&t4=&submit=Find+Players
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