The Mariners’ Rotation Is Carrying Them Through Their Hot Streak

On June 19, the Mariners lost 4–0 to the Angels. It was their second straight shutout loss, ending an 11-game homestand where they went 2–9, dropping them to a season-low 10 games under .500, and leaving their postseason odds at a minuscule 5.3%. Since then, they’ve gone 16–3 and tied the Blue Jays for the final American League Wild Card spot after sweeping them in four games last weekend, passing five teams in the standings during this hot streak and digging themselves out of a pretty deep hole.
As you’d expect for a team playing so well, Seattle has seen contributions from all across the roster. But the pitching staff has been particularly strong, leading the majors in ERA at 2.99 since the beginning of June — a period that includes that aforementioned horrible homestand. In that same span, the starting rotation has posted a 3.06 ERA, and from June 2 to 26, it put together a 24-game streak of allowing three or fewer earned runs. The group’s collective FIP and xFIP during this period are both more than a full run above their ERA, likely indicating some amount of good fortune, but any team that rattles off 16 wins in a 19-game stretch is bound to benefit from some luck. Still, despite the gap between their results and their peripherals, many of Seattle’s starters have made beneficial adjustments to their arsenals that have fueled a lot of their recent success.
Player | IP | K/BB | ERA | FIP | xFIP |
---|---|---|---|---|---|
Robbie Ray | 49.2 | 3.24 | 1.99 | 3.67 | 3.51 |
Logan Gilbert | 47 | 3.64 | 3.45 | 4.05 | 4.04 |
Marco Gonzales | 43.2 | 1.33 | 2.89 | 4.62 | 5.00 |
Chris Flexen | 39.2 | 1.93 | 3.40 | 3.44 | 5.08 |
George Kirby | 38.1 | 5.67 | 3.99 | 4.94 | 3.67 |
It all starts with the reigning AL Cy Young award winner, Robbie Ray. Diminished velocity led to a rough first couple of months; through his first 11 starts of the season, his ERA was sitting just under five, though his FIP and xFIP both painted a more optimistic picture. Some of that likely had to do with his propensity to allow a bunch of runs in a single bad inning in nearly all of his starts. But in his start against the Astros on June 6, he made a change to his pitch repertoire, adding a sinker — a pitch that’s now become an integral part of his arsenal:
Last year in Toronto, Ray leaned into his four-seam fastball and slider as his two primary pitches. He continued that trend in Seattle to the point where he was essentially a two-pitch pitcher during the first two months of the season. Whether it was the diminished velocity or batters simply figuring out his approach, he wasn’t nearly as effective. By introducing a sinker into his mix (and throwing his curveball a little bit more, too), he’s given opposing batters a new wrinkle to figure out. Read the rest of this entry »