The first major starting pitching trade has been made, as the Mariners and Reds announced a deal sending two-time All-Star Luis Castillo to Seattle.

 In exchange, the Reds bring back four prospects highly-regarded infielders Noelvi Marte and Edwin Arroyo and right-handers Levi Stoudt and Andrew Moore.

Castillo had been perhaps the prize of this year’s rotation market. After missing a few weeks due to shoulder soreness to open the year,

Castillo made his season debut in early May and has looked like a bona fide top-of-the-rotation arm. He’s made 14 starts and worked 85 innings,

pitching to a 2.86 ERA despite playing his home games in one of the league’s more hitter-friendly parks. Castillo has punched out a quality 25.8% of opposing hitters

against a solid 8% walk rate. This season’s 47.1% grounder percentage is down a bit relative to his 2019-21 levels, but it remains a few points better than the league average.

That’s 24th among 98 qualified starters over that stretch. His 26.8% strikeout rate ranks 23rd among that group, and he’s 12th with a 14.2% swinging strike percentage (whiffs per pitch).

He’s complemented the strikeout stuff with a massive 54.8% ground-ball percentage that ranks among the top ten.