When Kazuma Okamoto was rolling, the four-seam fastball was the pitch pitchers couldn’t afford to miss with. That’s no longer the case, and the change has completely altered the shape of his season with the Toronto Blue Jays.
The clearest break came in July, when opposing staffs stopped feeding him heaters in the zone and started attacking him a different way. In May and June, Okamoto punished four-seam fastballs to the tune of a .660 slugging percentage and a .426 xwOBA.
That kind of damage forced pitchers to back off, and it helped keep his walk rate near 10%. By August, though, the whole thing had flipped.
After a 154 wRC+ in June, he has posted a 0 wRC+ in August.
The underlying contact numbers show just how fast the decline hit. Against four-seamers, Okamoto posted a 20.6% Barrel rate and a 55.9% Hard-Hit rate from May through June.
From July through August, those marks fell to 5.3% and 36.8%. The balls that were leaving the yard earlier in the year have turned into routine outs.
That loss of authority has shown up in the type of contact he’s making, too. His infield fly-ball rate jumped from 8.1% in the first half to 22.2% in the second, a sharp sign that his swing is no longer producing the same kind of force.
Once the fastball stopped being a problem, pitchers were free to lean on everything else. That has been especially true with sliders and sweepers, where the issue hasn’t been whiffs. His Whiff% against those pitches has stayed around 43%, almost exactly where it was earlier in the season.
The difference is what happens when he does connect. Since July, Okamoto has produced a 0.0% Hard-Hit rate and a 0.0% Barrel rate against both sliders and sweepers.
In other words, he hasn’t squared up either pitch at all. What’s replacing that damage is soft opposite-field contact and routine ground balls.
The pressure has spilled over into his approach. After carrying a 9.6% walk rate in May, he hasn’t drawn a walk in August. Opponents have picked up on that urgency and worked the edges of the zone, knowing he’s trying to force the issue early in the count.
And once he gets behind, the at-bat tends to tilt heavily in the pitcher’s favor. His strikeout rate has climbed to 48.3% in 1-2 counts, where he owns a 36 wRC+, and to 51.4% in 0-2 counts, with a 65 wRC+.
Okamoto’s slide is a reminder of how quickly an offense can change when pitchers solve its foundation. When the four-seam fastball stopped being a weapon for him, everything else around it started to unravel, and opposing teams took full control from there.
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