The term 'season opener' refers to the first game of a season in a sport. The crossword solutions for this term are ESS (Early Season Start), MID (MID-Season), PRE (Pre-Season) and SSE (Season Start Early). Early Season Start is the beginning of the season, MID-Season is the middle of the season, Pre-Season is the period before the season starts and Season Start Early is when the season begins earlier than usual.