Warren Spahn had his best ERA in a season in 1953, with an ERA of 2.10.

Randy Johnson struck out his most batters in a game against the Reds on May 8, 2001, with 20 strikeouts.

Randy Johnson struck out his most batters in a game versus the Reds on May 8, 2001, with 20 strikeouts.

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

Sandy Koufax had his lowest 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 allowed 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 better than average in 1971.

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

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

Pedro Martinez fanned 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.