CBS said this about him
Holland has gotten off to a fantastic start this year, posting a 2.54 ERA and 2.39 FIP. While he's still using the same five pitches, he's changed up his usage rates. Holland's slider usage is up 10 percent this year. It's been his best strikeout pitch in the past, and Holland is using it a lot more with two strikes this season.
He's also working with an improved changeup. Not only is he using the pitch more often, but it's been three miles per hour slower than his old change. The pitch has mainly been used to neutralize righties, who have hit Holland much better during his career.
With his new skill set, Holland has been a major Fantasy surprise this year. If he moves forward with his approach, he might be a candidate to continue his breakout.
So I looked a little closer and not only is he calling different pitches than last year but the advanced stats all show very positive trends. swstr% has increased to 10.6% (from 8%) and batters are swinging a lot more (34.6% vs 28%) on pitches out of the zone and making less contact on those pitches. BB's are also down considerably.
Buy high because Holland looks like a soft ace even though he's not going to continue to be a <3 ERA guy (not including current stats).