In the 42 seasons of Seattle Mariners baseball, there have been 15 different Opening Day starting pitchers.
This season, the club will make that 16 when left-hander Marco Gonzales takes the mound to open the season in Tokyo March 20.
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Here they are year-by-year:
| YEAR | PITCHER | OPPONENT | RESULT |
| 2019 | Marco Gonzales | Oakland | TBD |
| 2018 | Felix Hernandez | Cleveland | 2-1 W |
| 2017 | Felix Hernandez | Houston | 3-0 L |
| 2016 | Felix Hernandez | Texas | 3-2 L |
| 2015 | Felix Hernandez | Los Angeles (AL) | 4-1 W |
| 2014 | Felix Hernandez | Los Angeles (AL) | 10-3 W |
| 2013 | Felix Hernandez | Oakland | 2-0 W |
| 2012 | Felix Hernandez | Oakland | 3-1 W |
| 2011 | Felix Hernandez | Oakland | 6-2 W |
| 2010 | Felix Hernandez | Oakland | 5-3 W |
| 2009 | Felix Hernandez | Minnesota | 6-1 W |
| 2008 | Erik Bedard | Texas | 5-2 W |
| 2007 | Felix Hernandez | Oakland | 4-0 W |
| 2006 | Jamie Moyer | Los Angeles (AL) | 5-4 L |
| 2005 | Jamie Moyer | Minnesota | 5-1 W |
| 2004 | Jamie Moyer | Anaheim | 10-5 L |
| 2003 | Freddy Garcia | Oakland | 5-0 L |
| 2002 | Freddy Garcia | Chicago (AL) | 6-5 L |
| 2001 | Freddy Garcia | Oakland | 5-4 W |
| 2000 | Jamie Moyer | Boston | 2-0 W |
| 1999 | Jeff Fassero | Chicago (AL) | 8-2 L |
| 1998 | Randy Johnson | Cleveland | 10-9 L |
| 1997 | Jeff Fassero | New York (AL) | 4-2 W |
| 1996 | Randy Johnson | Chicago (AL) | 3-2 W |
| 1995 | Randy Johnson | Detroit | 3-0 W |
| 1994 | Randy Johnson | Cleveland | 4-3 L |
| 1993 | Randy Johnson | Toronto | 8-1 W |
| 1992 | Randy Johnson | Texas | 12-10 L |
| 1991 | Erik Hanson | California | 3-2 L |
| 1990 | Brian Holman | California | 7-4 W |
| 1989 | Mark Langston | Oakland | 3-2 L |
| 1988 | Mark Langston | Oakland | 4-1 L |
| 1987 | Mark Langston | California | 7-1 L |
| 1986 | Mike Moore | California | 8-4 W |
| 1985 | Mike Moore | Oakland | 6-3 W |
| 1984 | Mike Moore | Toronto | 3-2 W |
| 1983 | Gaylord Perry | New York (AL) | 5-4 W |
| 1982 | Floyd Bannister | Minnesota | 11-7 W |
| 1981 | Glenn Abbott | California | 6-2 L |
| 1980 | Mike Parrott | Toronto | 8-6 W |
| 1979 | Glenn Abbott | California | 5-4 W |
| 1978 | Glenn Abbott | Minnesota | 3-2 W |
| 1977 | Diego Segui | California | 7-0 L |
Here’s who’s had the most:
| Player | OD Starts |
| Felix Hernandez | 11 |
| Randy Johnson | 6 |
| Jamie Moyer | 4 |
| Glenn Abbott | 3 |
| Mark Langston | 3 |
| Mike Moore | 3 |
| Freddy Garcia | 3 |
| Jeff Fassero | 2 |
Here’s who has the most in MLB history:
| Player | OD Starts |
| Tom Seaver | 16 |
| Steve Carlton | 14 |
| Randy Johnson | 14 |
| Walter Johnson | 14 |
| Jack Morris | 14 |
| Walter Johnson | 14 |
| Jack Morris | 14 |
| Roger Clemens | 13 |
| Robin Roberts | 13 |
| Grover Cleveland Alexander | 12 |
| Bert Blyleven | 12 |
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