Toronto Blue Jays at Seattle Mariners (2026-07-03). Dylan Cease vs Luis Castillo at T-Mobile Park.
Cease brings the stronger season profile into this matchup, working to a 3.02 ERA and 1.24 WHIP across 83.1 innings with an elite 13.82 K/9, though his 4.32 BB/9 keeps traffic on the bases. His recent run has been sharp and consistent rather than volatile, allowing two earned runs or fewer in each of his last five starts while piling up 44 strikeouts in 25.2 innings, and his trend indicators label him flat and stable with no blow-up starts. Castillo has logged a 4.93 ERA and 1.36 WHIP in 76.2 innings, with a more moderate 8.57 K/9 and 3.05 BB/9. His recent form is more uneven despite a downward ERA trend marker, as his last five starts include a seven-earned-run outing against Houston, and his 33.3 percent blow-up rate plus alternating pattern suggest more start-to-start variance.
The offenses are fairly close in overall production. Toronto owns a .700 OPS and 354 runs with a .248 average, while Seattle has a .694 OPS and 357 runs, pairing lower batting average with more power at 105 home runs and a stronger walk count of 296. On the mound as full staffs, Seattle has the cleaner edge with a 3.65 team ERA and 1.18 WHIP compared with Toronto's 4.08 ERA and 1.31 WHIP, even though both clubs post similar strikeout rates around nine per nine. Recent form is mixed for both sides, with Toronto dropping six of its last seven listed games and Seattle going 4-6 over its last ten listed results.
Last season's head-to-head sample was split 3-3, but the scoring pattern leaned offense, with four of the six meetings producing at least nine total runs and Toronto taking the most recent three by scores of 6-3, 6-3, and 9-1. With no listed total available, the matchup presents a push and pull between Cease's swing-and-miss dominance and Seattle's stronger overall run prevention on one side, and Castillo's less reliable recent game log plus a history of higher-scoring meetings on the other. T-Mobile Park can suppress damage, but the recent head-to-head scores do not automatically point to a low-event game.
