Arizona Diamondbacks vs Seattle Mariners Preview
Today's Starting Matchup
Today's starting pitching matchup features Arizona Diamondbacks's Ryne Nelson (2-3, 4.65 ERA) against Seattle Mariners's Bryan Woo (4-3, 3.82 ERA).
Both starters carry similar ERAs, setting the stage for a potential pitchers' duel. WHIP: Ryne Nelson 1.18, Bryan Woo 1.04.
Advanced metrics: Ryne Nelson — FIP 4.85, K% 19.3%, 60.0 IP / Bryan Woo — FIP 3.23, K% 23.0%, 63.7 IP
Team Season Comparison
2026 season record: Arizona Diamondbacks 31-25 (.554), Seattle Mariners 29-29 (.500).
Arizona Diamondbacks holds the edge in the season standings, though Seattle Mariners can't be counted out based on head-to-head matchups.
Recent form: Arizona Diamondbacks on a 1-game losing streak, Seattle Mariners on a 4-game win streak.
Based on starting pitching, Seattle Mariners holds the edge.
Bullpen Analysis
Arizona Diamondbacks bullpen: 13 relievers on the active roster. Key arms: Brandon Pfaadt 5.59 ERA, 30K in 37.0IP, Brandyn Garcia 0.90 ERA, 11K in 10.0IP, Eduardo Rodriguez 2.31 ERA, 49K in 66.1IP.
Seattle Mariners bullpen: 13 relievers on the active roster. Key arms: Alex Hoppe 6.35 ERA, 12K in 11.1IP, Andrés Muñoz (Closer) 4.98 ERA, 34K in 21.2IP, Bryan Woo 3.82 ERA, 59K in 63.2IP.
Win Probability
Projected win probability: Arizona Diamondbacks 45% vs Seattle Mariners 55%
Factors: Seattle Mariners's starter owns the lower ERA, Seattle Mariners's home-field advantage. Of course, baseball's inherent randomness means actual results may differ.
Key Tactical Points
Workload comparison: Ryne Nelson averages 5.5 IP per start vs. Bryan Woo at 5.8 IP. Getting six-plus innings from the starter significantly eases the bullpen burden.
Ryne Nelson has allowed 11 HR this season — a concern against a lineup with extra-base power.