From Wikipedia:
A term used for the last game of a series or match when the two teams have evenly split the previous games. See also rubber bridge / best-of-three playoff.
Given that this weekend series meets the requirements outlined above, we can deem this competition a rubber match.
Your lineups for this competition.
Royals
Cain CF
Hosmer 1B
Gordon LF
Rios RF
Infante 2B
Colon 3B
Young P
Red Sox
Betts CF
Holt 3B
Pedroia 2B
Ortiz DH
Napoli 1B
De Aza RF
Leon C
Miley LHP
As outlined above, Wade Miley will face Chris Young on the bump(s).