Terry Collins doesn’t enjoy the luxury of lineup consistency major league managers long for. Every day, the Mets manager must shuffle his pieces to maximize production based on a variety of factors. They are, essentially, educated guesses based on statistics and gut feelings in hopes of sparking an anemic offense. His formulas have succeeded on occasion this season. Usually, they have not. His strategy Wednesday did. Collins decided to insert Marlon Byrd in right field over Jordany Valdespin, who reached base three times the night before. Byrd hit two home runs in the Mets’ 10-1 blowout victory over the Nationals. Last night, Collins was set to make a more drastic move: He penciled in Justin Turner for left field. It would have been Turner’s first major-league start in the outfield, but rain postponed the series finale, which will be made up as part of a split doubleheader on July 26. "What you try to do is get your matchups as best you can," said Collins, who has used eight different leadoff hitters this season. "And have guys that you think have a batter chance of getting hits at certain times. "But it all comes down to the guys that are supposed to get it done, got to get it done. That’s the name of the game." A couple players the Mets were counting on this season have not produced as projected, resulting in Collins’ daily lineup game of musical chairs. First baseman Ike Davis, the cleanup batter on Opening Day, is hitting .166. His slugging percentage of .265 is worst among qualifying players. Shortstop Ruben Tejada was hitting .209 when he was placed on the disabled list last week with a quadriceps injury. His .262 slugging is the worst among regulars. His eight errors are tied for most among major-league shortstops.