The Seattle Mariners 2006 season was their 30th since the franchise creation, and their third consecutive season finishing at the bottom of the American League West, finishing with a 78–84 (.481) record.
The Seattle Mariners 2005 season was their 29th since the franchise creation, and their second consecutive season finishing at the bottom of the American League West, finishing with a record of 69–93 (.426). They only had one player represented at the 2005 All-Star Game, who was Ichiro Suzuki with his fifth selection for the All-Star Game.
The Seattle Mariners 1998 season was their 22nd season, and was the final year in which Kingdome was the home venue for the entire season. Their record was 76–85 (.472) and they finished in third place in the four-team American League West, 11½ games behind the champion Texas Rangers.
The Seattle Mariners 1987 season was their 11th since the franchise creation, and ended the season finishing fourth in the American League West with a record of 78–84 (.481).
The 1977 Seattle Mariners season was the first season in franchise history, which was established via the 1977 Major League Baseball expansion. The creation of the Mariners brought baseball back to Seattle, which had been without a major league team since the Seattle Pilots left for Milwaukee to become the Brewers in April 1970.
The 2001 Cleveland Indians season was the 101st season for the franchise.
The 2014 Seattle Mariners season was the 38th season in franchise history. The Mariners played their 15th full season at Safeco Field. They were competitive all season and were not eliminated from post-season contention until the last day of the season, finishing with a respectable 87–75 record and third place in the American League West.
The 2015 Seattle Mariners season was the 39th season in franchise history. The Mariners played their 16th full season at Safeco Field and finished the season with a record of 76–86.
The 2016 Seattle Mariners season was the 40th season in franchise history. The Mariners played their 17th full season at Safeco Field. Despite finishing with a winning record of 86–76, they failed to make the playoffs, finishing second place in the American League West.
The 2017 Seattle Mariners season was the 41st season in franchise history. The Mariners played their 18th full season at Safeco Field and finished with a record of 78–84. They failed to qualify for the postseason, extending their drought to 16 years. In addition to being the longest current streak in MLB, the drought became the longest currently in the four major North American professional sports when the National Football League's Buffalo Bills made it to the playoffs in December of that year.
The 2018 Texas Rangers season was the 58th of the Texas Rangers franchise overall, their 47th in Arlington as the Rangers, and their 25th season at Globe Life Park in Arlington. The Rangers began the season on March 29 against the Houston Astros and finished the season on September 30 against the Seattle Mariners.
The 2018 Seattle Mariners season was the 42nd season in franchise history. The Mariners played their 19th full season at Safeco Field, their home ballpark. After the Buffalo Bills of the NFL clinched a playoffs spot for the first time since 1999, The Mariners entered this season with the longest active playoff drought in the four major North American professional sports, failing to make their first postseason appearance since 2001. At several points in the season, the Mariners were 10 games ahead of the Oakland Athletics in the AL Wild Card race, but ended up finishing eight games behind them. The Mariners were eliminated from playoff contention on September 22 with the Athletics win against the Minnesota Twins. The Mariners began the season on March 29, 2018 against the Cleveland Indians and finished the season on September 30 against the Texas Rangers.
The 2019 Seattle Mariners season was the 43rd season in franchise history. The Mariners played their twentieth full season and twenty-first overall at newly renamed T-Mobile Park, their home ballpark. The Mariners entered the season with the longest active playoff drought in the four major North American professional sports and again failed to make their first postseason appearance since 2001. The Mariners started the season with a 13–2 record, their best start in franchise history. However, they went 55–92 after their great start, finishing last in the American League West for the first time since 2012 and falling out of the playoffs once again.
The 2020 Seattle Mariners season was the 44th season in franchise history. The Mariners played their 21st full season at T-Mobile Park, their home ballpark. The Mariners entered this season with the longest active playoff drought in the four major North American professional sports leagues, attempting to make their first postseason since 2001. They also entered this season as the only team to not win a league pennant.
The 2020 Major League Baseball season was the San Francisco Giants' 138th year in MLB, their 63rd year in San Francisco since their move from New York following the 1957 season, and their 21st at Oracle Park. It was the first under the leadership of the team's new manager, Gabe Kapler, who replaced the recently retired Bruce Bochy, and new team general manager Scott Harris.
The 2021 Baltimore Orioles season was the 121st season in Baltimore Orioles franchise history, the 68th in Baltimore, and the 30th at Oriole Park at Camden Yards. They significantly failed at attempting to improve on their 25–35 (.417) record from the previous year. The Orioles endured two different losing streaks of 14 or more between the middle and the end of May, as well as between August 3 and August 24. The Orioles pitching staff combined for a franchise-worst ERA of 5.84 and yielded 911 earned runs in the season, which led MLB and was the most earned runs surrendered by a pitching staff since the 2001 Texas Rangers allowed 913 earned runs. All of the team's pitchers that made a start finished the season with a losing record. The Orioles were eliminated from playoff contention on August 28 with their loss to the Tampa Bay Rays. They suffered their 3rd 100+ loss season in four years with their loss to the Boston Red Sox on September 17. With the Orioles loss in the season finale against the Blue Jays, they suffered their second 110-loss season in team history; it was also the third such season in overall franchise history, going back to their time as the St. Louis Browns.
The 2021 Seattle Mariners season was the 45th season in franchise history. The Mariners played their 22nd full season at T-Mobile Park, their home ballpark in Seattle, Washington. The M's entered this season with the longest active playoff drought in the four major North American professional sports leagues, attempting to make their first postseason in twenty years. Seattle is the only current Major League Baseball (MLB) franchise without a World Series appearance. Despite posting a 90–72 record, their best since the 2003 season, the Mariners were eliminated from postseason contention for the 20th consecutive season after Boston swept the Washington Nationals to clinch the wild card berth and the Yankees clinched the remaining wild card spot on the last day of the season. This season was the second time during their drought that they’d won two more regular season games than the World Series champions.
The 2023 Texas Rangers season was the 63rd of the Texas Rangers franchise overall, their 52nd in Arlington as the Rangers, and the fourth season at Globe Life Field. It was also the team's first season under the management of Bruce Bochy.
The 2023 Seattle Mariners season was the 47th season in franchise history. The Mariners played their 24th full season at T-Mobile Park, their home ballpark in Seattle, Washington. Despite Seattle having shown signs of competitiveness, and having a 90.2% chance to make the playoffs on September 2 while having 1st place in the AL West, the Mariners missed the playoffs for the 22nd time in 23 seasons.
The 2023 Cleveland Guardians season was the 123rd season for the franchise, which competed in the American League of Major League Baseball (MLB). This was the franchise's second season using the "Guardians" nickname, and 11th and final season under manager Terry Francona, the longest-tenured manager in MLB entering the 2023 season. They entered the season as the defending American League Central champions. The team opened the regular season on March 30, losing on the road against the Seattle Mariners, and concluded the regular season on October 1, losing on the road against the Detroit Tigers. They failed to improve on their 92–70 record from the 2022 season.
