Sandy Koufax had his best ERA in a season in 1966, with an ERA of 1.73.

Jose Bautista and James Loney are tied for the most career hits against Dellin Betances, with 5 hits.

Dellin Betances gave up his most extra-base hits in a game 5 times, with 2 XBH.

Jose Bautista and James Loney are tied for the most career extra-base hits against Dellin Betances, with 3 XBH.

highest era in a season by a league since 1931

Denny McLain was 24.8 runs better than average in 1968.

Vida Blue was 41.4 runs above average in 1971.

Jake Arrieta was 4.4 runs worse than average in his rookie season in 2010.

Pedro Martinez struck out his most batters in a game on May 6, 2000 and on September 10, 1999, with 17 strikeouts.

Pedro Martinez fanned his most hitters in a game on May 6, 2000 and on September 10, 1999, with 17 strikeouts.

Pedro Martinez struck out his most hitters in a game on May 6, 2000 and on September 10, 1999, with 17 strikeouts.

Pedro Martinez has the most runs above average with 25+ starts in a season, with 79.4 in 1999.

Tony Gonsolin has the highest win percentage with 20+ starts in a season, at .941 in 2022.

Since 1961, Bob Gibson has the best ERA with 150.0+ innings pitched in a season, with an ERA of 1.12 in 1968.

Since 1961, Pedro Martinez has the lowest WHIP with 162.0+ innings pitched in a season, with a WHIP of 0.74 in 2000.