Here are the possible solutions for they're up first in baseball clue
Answer
Clue
Relevancy
awayteam
Clue
They're up first, in baseball
fun
Clue
First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f
Definition
to act playfully
mets
Clue
They finished their first season 60 1/2 games out of first
Definition
MET, (short for) meteorology
pnc
Clue
Pennsylvania baseball park that might (weirdly) host playoff baseball in 2013
aaron
Clue
First-ballot Baseball Hall of Famer of 1982
First player listed in "Total Baseball"
First name alphabetically in the Baseball Hall of Fame