If Kershaw goes six innings and gives up no more than four earned runs in his next trip to the mound, it means his ERA will be under 2.00 over his last 100 starts (dating all the way back to July 7, 2011). Yes, I said 100 starts. (He's at 1.96 over his last 99 at the moment.)
So who's the last pitcher to have a 100-start stretch (or longer) with an ERA tinier than 2.00? Who else? Maddux, of course. He had a 1.99 ERA over an incredible 132 starts, spanning the final month of 1991 and all of the next four seasons.