Clayton Kershaw dominated the Miami Marlins on Thursday, lowering his ERA to a Major-League best 1.72.

Only four pitchers have posted a sub-1.80 ERA at least 25 starts into a season. Dwight Gooden, Greg Maddux, Roger Clemens and Pedro Martinez accomplished the feat.

"He kind of gets himself into routines and he's just marching onward all the time. One start's over and he's on to the next one. That one's over and it's time to start the next process," Don Mattingly said.

"What I enjoy with Clayton is that it's every pitch, every batter, no matter what the score is, he attacks, he's focused, he's not wanting to make one bad pitch, not wanting to let any runners on. He just wants to execute, execute, execute. That's tough to do over a long season. He's a machine."