MLB First 5 & NRFI

Reading first-inning and first-five numbers

Scored in the 1st is the share of games a team scored at least once in the first inning; Allowed a run in the 1st is the same for its pitchers. NRFI % is the share of its games in which neither team scored in the first. First-5 numbers cover the first five innings only: the share of games the team led, the share tied, and the run differential.

For starters, scoreless first innings is the share of his starts with no run in the first, and first-5 runs allowed is what his team allowed through five in his starts.

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First inning & first 5

Scored in the 1st (1st R%)

Share of games in which the team scored at least once in the first inning. Higher is better.

Allowed a run in the 1st (1st RA%)

Share of games in which the team allowed at least one run in the first inning. Lower is better.

No run in the 1st (both teams) (NRFI%)

Share of the team's games in which neither team scored in the first inning. Neither higher nor lower is better on its own.

First-inning runs per game (1st R/G)

Runs scored in the first inning, per game. Higher is better.

First-inning runs allowed per game (1st RA/G)

Runs allowed in the first inning, per game. Lower is better.

First-5 win % (F5 W%)

Share of games the team led after five innings (ties count as games not won). Higher is better.

First-5 tie % (F5 T%)

Share of games tied after five innings. Neither higher nor lower is better on its own.

First-5 run differential per game (F5 RD/G)

Runs scored minus runs allowed through five innings, per game. Higher is better.

First-5 runs per game (F5 R/G)

Runs scored through five innings, per game. Higher is better.

First-5 runs allowed per game (F5 RA/G)

Runs allowed through five innings, per game. Lower is better.