4. Seattle Barely Miss out on the Playoffs
If the team had made the postseason, it would've been the second time in franchise history that the Mariners were in the playoffs for two consecutive seasons. In an extremely competitive race for the AL West as well as the third AL Wild Card spot, it came down to the wire.
On the 161st game of the season, the Mariners lost 6-1 to the Texas Rangers and the Houston Astros won 1-0 against the Arizona Diamondbacks. Being three games behind the division-leading Texas Rangers and two games behind the Houston Astros and Toronto Blue Jays with one game left to play meant that it was all over for Seattle.
It was a heartbreaking end to a year where the team was so close to repeating the glory of 2022, especially given how the Mariners eventually went 3-1 against the Rangers in their final series of the year. Furthermore, if the Astros or Blue Jays had lost one more game, it could've created just enough room for Seattle to squeeze into October.