Pitcher A: 8.95 k/9, 1.88 bb/9, FIP 3.39, xFIP 3.03, SIERA 3.10, 63.3% first pitch strikes, 10.4% swinging strikes
Pitcher B: 8.84 k/9, 2.54 bb/9, FIP 3.20, xFIP 3.34, SIERA 3.25, 58.9% first pitch strikes, 10,9% swinging strikes
A is Kluber, B is Strasburg.
Admittedly this is only this season, and a longer term view would certainly paint a better picture for Strasburg, but my point is that Kluber's ERA of 4.08 is not indicative of just how well he is pitching.
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Pitcher B: 8.84 k/9, 2.54 bb/9, FIP 3.20, xFIP 3.34, SIERA 3.25, 58.9% first pitch strikes, 10,9% swinging strikes
A is Kluber, B is Strasburg.
Admittedly this is only this season, and a longer term view would certainly paint a better picture for Strasburg, but my point is that Kluber's ERA of 4.08 is not indicative of just how well he is pitching.