D-Backs vs Mariners Expert Picks and Betting Tips - Sunday May 31, 2026

+125O/U: 7.5
(+100/-120)-145

Arizona Diamondbacks – Moneyline (+125)
Among every team playing today, the 2nd-strongest infield defense is that of the the Arizona Diamondbacks.
Explain: Defense is an integral part of preventing hits and runs.
Ildemaro Vargas – Over/Under 0.5 Total Bases (-170/+130)
The leading projection system (THE BAT X) estimates Ildemaro Vargas’s true offensive talent to be a .273, suggesting that he has had some very good luck this year given the .074 gap between that mark and his actual .347 wOBA.
Explain: Players that are overperforming should be expected to play worse going forward, which can create value on prop Unders if the lines are too heavily weighing the lucky, to-date overperformance.
Arizona Diamondbacks hitters collectively have been among the worst in Major League Baseball this year ( 7th-worst) when assessing their 88.3-mph average exit velocity.
Explain: Hitting the ball hard increases the chances of either a home run or the ball landing in fair territory for a hit before a fielder can get to it.

Despite technically being the “starter” today, Bryce Miller may not last more than a couple framess since he will be treated as more of an opener.
Explain: Openers have become a common strategy where a relief pitcher is used for the first (and maybe second) inning. This can suppress early run scoring as relievers are generally of a higher quality than non-ace starters.
Luke Raley – Over/Under 0.5 Total Bases (-140/+110)
Luke Raley has made big improvements with his Barrel%, bettering his 10.7% rate last season to 20.7% this season.
Explain: Barrel% measures how often a player hits the ball at the optimal exit velocity and launch angle and is a terrific measure of underlying power.
Josh Naylor – Over/Under 1.5 Total Bases (+135/-175)
Josh Naylor pulls a high percentage of his flyballs (36.6% — 89th percentile) and is a great match for the park considering he’ll be hitting them towards the league’s 4th-shallowest RF fences in today’s game.
Explain: This player’s skill set matches up particularly well with the park he’s in today, which may lead to better-than-usual performance.

Seattle Mariners – Over/Under 1.5 1st Five Innings (F5) Team Total (-160/+125)
The Seattle Mariners have hit the 1st Five Innings (F5) Team Total Under in 21 of their last 35 games (+5.15 Units / 12% ROI)
Over/Under 7.5 Game Total (+100/-120)
The Arizona Diamondbacks have hit the Game Total Over in 20 of their last 35 away games (+6.05 Units / 16% ROI)
Julio Rodriguez – Over/Under 0.5 Home Runs (+440/-700)
Julio Rodriguez has hit the Home Runs Over in 4 of his last 6 games (+15.30 Units / 255% ROI)

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