Seattle Mariners vs Arizona Diamondbacks Spring Training Betting Preview and Odds Insight

Key facts

Moneyline markets will hinge on the named starting pitchers and how many innings they are expected to throw. Books may open with relatively tight odds, for example in the -115 to +105 range on either side, and adjust once lineups and pitch counts become clearer. The run line at -1.5 or +1.5 can be volatile, because late-inning defensive changes and younger pitchers often create scoring swings. Totals in Spring Training commonly sit in the 8.5 to 10.5 runs range, reflecting limited starter workloads and mixed-quality relief pitching.

Spring Training games often feature short outings for starting pitchers followed by lower-tier bullpen arms, which can increase late scoring volatility. With both teams likely to prioritize evaluation over match result and to rotate in depth hitters, the probability of defensive lapses and high-scoring innings rises. Typical preseason totals in similar spots sit in the 8.5 to 10.5 range, and an over 8.5 leans slightly toward the expectation of at least one big inning from either side, assuming average hitting condi.