Answered June 18th, 2019

Jacob deGrom allowed two runs in 8 1/3 IP, striking out 10 in the process to bring his career K/9 to 10.12 - which is currently the best by a pitcher in Mets team history.

Which Mets pitcher has the best career K/9?
Interpreted as:
Which Mets pitcher has the best career K/9 with a minimum of 750 IP?