Yesterday afternoon Masahiro Tanaka had the kind of start that usually isn’t associated with being an ace, but does show the difference between good pitchers and great pitchers. He held the high-powered Blue Jays to two runs in 6.1 innings despite clearly not having his best stuff. Tanaka wasn’t even on the mound when the second run scored. It was an inherited runner that a pair of rookie relievers couldn’t strand.

Following yesterday’s game, Tanaka is now sitting on a 3.11 ERA (3.26 FIP) in 26 starts and 179.1 innings. The FanGraphs version of WAR says he’s been the best pitcher in the AL at +4.7 WAR. (Technically tied with Chris Sale, who’s thrown 14.1 more innings.) Baseball Reference says Tanaka has been the sixth best pitcher in the AL at +4.7 WAR. You don’t need WAR to tell you he’s been really, really good though.

Tanaka has never not been good for the Yankees. Last season he had a 3.51 ERA (3.98 FIP) in 154 innings, and while that is disappointing compared to his 2014 debut, it still made him an effective starter. The Yankees have won 13 of his last 15 starts and he is far and away the best pitcher in the rotation. It’s not even close. Tanaka might not win the Cy Young, but he should get votes. Heck, you could argue he deserves MVP votes too.

“As a professional baseball player, it’s better to have attention because that means you’re doing a good job,” said Tanaka to Chad Jennings yesterday. “I think the first year, it was more like, ‘who is this guy from Japan coming here? And how is he going to make it out there?’ I think there was a lot of curiosity and interest in that sense, but as a pitcher, you always want to do well, and that means you’re getting attention. So you want that attention because you want to do well.”

Although the overall numbers don’t exactly match, Tanaka has been able to regain his 2014 pre-injury form this season, especially recently. He missed time with the partially torn elbow ligament in 2014, then had wrist and hamstring issues in 2015, and over the winter he had a bone spur removed from his elbow. Tanaka’s dealt with more than a few physical problems, and those can obviously impact a pitcher’s ability to execute and effectiveness.

Here is Tanaka’s rolling five-start ERA and FIP since his debut in 2014, via FanGraphs. He started out swell, then his performance slipped as the injuries struck, and now he’s back to what I assume is 100% effectiveness.

The biggest different between the pre-injury version of Tanaka and the current version of Tanaka is his strikeout rate. He struck out 26.6% of the batters he faced in 2014 before the elbow started barking. It’s 20.8% this year, which is still good, but not quite as good. Tanaka has been able to compensate for the missing strikeouts by keeping the ball in the park: 1.04 HR/9 (14.4 HR/FB%) vs. 0.85 HR/9 (10.4 HR/9%).

The performance has been very good this year and ultimately that’s the most important thing. A pitcher’s job is to keep runs off the board, first and foremost, and Tanaka has done that. He’s done it while changing his style almost month-to-month. You can call it evolving if you want, but he’s gone back to his original state a few times, so yeah. Check out his four-seamer fastball and sinker usage over the years, via Brooks Baseball:

Earlier this season Tanaka was throwing a ton of sinkers and it was easy to think he was doing that because of his home run problem last year. More sinkers equals more ground balls and fewer balls leaving the park, especially in Yankee Stadium. The sinker heavy approach hasn’t lasted. Tanaka cut back on his sinker at midseason and is now using the four-seamer more. Two years ago he cut back on the four-seamer at midseason and started throwing sinkers.

As cliche as it is, Tanaka is a pitcher and a not a thrower. He’s not going to blow hitters away with fastballs, though we have seen him reach back for a little extra something in big spots. Example:

Moments like that, when Tanaka reaches back and throws a fastball by a hitter, are very rare. He can do it if necessary, but his preferred method of attack is trickery. Tanaka throws a wide array of breaking balls and offspeed pitches, and he changes speeds very well. A splitter in the dirt is his trademark. The sliders on the corner and first pitch strike-stealing curveballs are important too.

At this point it’s obvious Tanaka was smart not to have Tommy John surgery in 2014. (Can’t believe the doctors knew more than fans and reporters, you guys.) It’s a serious procedure you try to avoid. Tanaka has avoided the knife but has dealt with some other injuries, most notably the bone spur surgery. And as good as he was last year, he wasn’t as good as he was in 2014 or as good as he’s been this year. The injuries took their toll. That doesn’t seem to be the case anymore.

“I’m not overly satisfied with the overall way of pitching, how I’m pitching this year,” said Tanaka to Jennings. “I think if I compare it with my first year — the first year, I didn’t know anything. I just was grinding it out every game because I didn’t know much about what it was like to spend a full season here. But this year I feel like I’m more in control of myself compared to the first year. In that sense, I feel sort of a sense of maybe satisfaction compared to the first year.”

The Yankees will face a bit of a conundrum with Tanaka next season, because if he stays healthy and effective, he’s going to opt-out of his contract, and pitchers of this caliber are hard to replace. For now, Tanaka is over his injury problems and pitching like the high-end starter the Yankees paid him to be. He was at his very best early in 2014, before the elbow injury. Right now he’s pitching better than he has at any point since then.