0.56 ERA is the lowest in a pitcher's first 10 starts of a season since ERA became an official statistic in 1913

0.53 WHIP is the lowest by any pitcher in his first 10 starts of a season since the mound was moved to 60 feet, 6 inches in 1893. It's also the lowest WHIP for a pitcher in any 10-start span, at any point in a season, since at least 1901 (min. 50 IP).

reached 100 strikeouts in 61 2/3 innings, the fastest any starter has reached 100 strikeouts in a season since the mound was moved to its current distance in 1893

has five RBIs this season and has allowed just four earned runs. He's the first pitcher with more RBIs than earned runs allowed over any 10-start span in a single season since RBI became an official stat in 1920

https://www.mlb.com/news/jacob-degrom-2021-era-and-stats-tracker

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