Jacob deGrom holds himself to high standards.

The New York Mets right-hander struck out 12 Boston Red Sox batters on Sunday and still walked away unhappy with his performance, which included three earned runs and five hits across seven innings during a 4-3 loss.

"I'm not happy with it. I don't like giving up runs," the 30-year-old said, according to MLB.com's Anthony DiComo.

All of the damage against the National League Cy Young candidate came in the third inning. After Mookie Betts' sacrifice fly scored Rafael Devers, Brock Holt's two-run home run extended Boston's lead to 3-0.

Here is Jacob deGrom breaking down his no-decision: pic.twitter.com/kSUXi9wyzV — Anthony DiComo (@AnthonyDiComo) September 16, 2018

After the third, however, deGrom settled in and retired 12 of the next 15 hitters he faced, including six via strikeout.

It's been a historically strange season for the two-time All-Star, whose only managed an 8-9 record despite owning a league-best 1.78 ERA.