Seattle Mariners at Washington Nationals (2026-06-13). Luis Castillo vs Cade Cavalli at Nationals Park.

Luis Castillo enters this matchup with a season ERA of 5.16 and a WHIP of 1.36 across 61 innings pitched in 11 starts, demonstrating a K/9 rate of 9.0 and a BB/9 of 3.39. His recent performance indicates an alternating pattern with a downward trend in ERA, but also a high blow-up rate of 33.3 percent and a low quality start percentage of 16.7 percent. Over his last five outings, Castillo has shown significant inconsistency, ranging from 0 earned runs over 6 innings against the Yankees to 7 earned runs in just 3.1 innings versus the Astros, highlighting a volatile recent stretch. Cade Cavalli, for the Nationals, has posted a more favorable season ERA of 3.88 and a WHIP of 1.44 through 69.2 innings across 14 starts, with a K/9 of 9.82 and a BB/9 of 3.23. Cavalli's metrics suggest a stable pattern with a flat ERA trend and a zero percent blow-up rate, though his quality start percentage mirrors Castillo's at 16.7 percent. His recent starts include a 6-inning, 1-earned-run performance against the Phillies, but also a short 1.1-inning, 4-earned-run outing versus the Pirates, indicating some variability in his ability to pitch deep into games.

The Seattle Mariners' offense has generated 307 runs with a collective OPS of 0.719, driven by 93 home runs, indicating a moderate power threat. Their pitching staff, however, stands out with a strong team ERA of 3.57 and a WHIP of 1.18, alongside an 8.67 K/9 rate, allowing only 69 home runs. This suggests a pitching-reliant team. Conversely, the Washington Nationals' offense has been more productive, scoring 374 runs with a higher OPS of 0.739, hitting 91 home runs. The Nationals' pitching staff presents a stark contrast, holding a team ERA of 4.74 and a WHIP of 1.39, with a lower K/9 of 7.72 and having surrendered 101 home runs, suggesting a more susceptible unit on the mound.

Recent head-to-head contests from May 2025 between these two clubs featured elevated scoring, with the Nationals securing victories by scores of 9-3 and 9-0, while the Mariners took one game 9-1. These outcomes suggest a propensity for offenses to break through. The current total line of 9.0 aligns with the historical tendency for higher-scoring affairs in this particular matchup, especially considering both starting pitchers have demonstrated periods of vulnerability and the Nationals' overall team pitching metrics are less robust.

The away lineup features no batters with prior MLB history against Cade Cavalli. Players such as Cole Young, Julio Rodríguez, Josh Naylor, and Luke Raley will all be seeing Cavalli for the first time in a major league game. Similarly, Dominic Canzone, Victor Robles, Miles Mastrobuoni, Mitch Garver, and Colt Emerson also have no previous plate appearances against the right-hander.

Luis García Jr. has a notable history against Luis Castillo, recording 3-for-9 in their matchups, which translates to a .333 batting average and a .666 OPS. CJ Abrams has also found success against Castillo, going 1-for-3 for a .333 average and a .666 OPS in his limited plate appearances. However, the majority of the home lineup, including James Wood, Curtis Mead, Daylen Lile, Dylan Crews, José Tena, Drew Millas, and Nasim Nuñez, have no MLB history against Luis Castillo.

The home side clearly has more familiar hitters against the opposing starter, with two players having prior MLB experience against Luis Castillo. Conversely, the away team's entire lineup will be facing Cade Cavalli for the very first time in a major league contest.