Since the Mets will have passed the one-third mark of the season by the next game that deGrom starts, this is a convenient point to project his accomplishments for the next two-thirds of 2021. Specifically, what will he need to do to break Bob Gibson's ERA record of 1.12? A quick, back-of-the-envelope answer is simply to take his current distance from that mark (1.12 minus .61 equals .51) and cut that figure in half (about .25) and add that to 1.12. That figure (1.37) represents the ERA that deGrom would have to reach, given an equal number of innings to his current pace) over the last two-thirds of the season in order to match Gibson's 1.12. In other words, he is way ahead of Gibson's ERA, but would have to maintain a spectacular 1.37 ERA for nearly four more months, just to tie Gibson. No one has posted an ERA nearly as low as 1.37 since Gibson did it in 1968. The best anyone has done is Gooden's 1.53 in 1985. So deGrom would still need to beat Gooden's Met record by a sixth of an earned run per nine innings from here on out just to tie Gibson's mark. It's still a very heavy lift. We could compute this number more precisely, but of course precision is nearly impossible in such matters: deGrom's 2021 numbers—innings pitched, games started, earned runs—will rely on his luck and his health in addition to his skill. I think the figure of 1.37 is close enough to the mark, given all the unknown variables, that further precision is futile. Of course, there is no way that he will come close to tying Gibson's number of innings pitched in 1968, so if he matches, or even beats, the 1.12 mark, there will be those who will credit Gibson with having accomplished a much harder task, and it's hard to argue with that point. Multiplying his current stats by 3, he's on pace to go 15-6, with 174 IP in 27 games.