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3/11/17 Chicago White Sox assigned P Mayckol Guaipe to the major league roster.
8/6/16 Seattle Mariners signed P Mayckol Guaipe.
8/4/16 Seattle Mariners released P Mayckol Guaipe.
5/17/16 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast).
4/25/16 Seattle Mariners called up P Mayckol Guaipe from Triple-A Tacoma (Pacific Coast).
3/30/16 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast).
8/30/15 Seattle Mariners called up P Mayckol Guaipe from Triple-A Tacoma (Pacific Coast).
8/15/15 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast).
8/4/15 Seattle Mariners called up P Mayckol Guaipe from Triple-A Tacoma (Pacific Coast).
7/9/15 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast). Analysis
7/4/15 Seattle Mariners called up P Mayckol Guaipe from Triple-A Tacoma (Pacific Coast). Analysis
6/2/15 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast).
6/1/15 Seattle Mariners called up P Mayckol Guaipe from Triple-A Tacoma (Pacific Coast).
3/16/15 Seattle Mariners optioned P Mayckol Guaipe to Triple-A Tacoma (Pacific Coast).
11/20/14 Seattle Mariners selected the contract of P Mayckol Guaipe from Double-A Jackson (Southern).
3/3/14 Seattle Mariners assigned P Mayckol Guaipe to the major league roster.

Sam Miller is the editor-in-chief of Baseball Prospectus. He has written for two Baseball Prospectus annuals and co-edited the 2014, 2015 and 2016 editions. He also co-hosts, with Ben Lindbergh, the Effectively Wild podcast, and is the co-author of The Only Rule Is It Has To Work, about his experience running baseball operations for an independent minor-league team.