The A’s are counting on a rookie to take down the Tigers in Thursday’s decisive Game 5 of the American League Division Series with 23-year-old Sonny Gray getting the nod over veteran Bartolo Colon. Oakland manager Bob Melvin announced the decision on a conference call Wednesday afternoon less than 24 hours after his club suffered an 8-6 loss in Detroit to force Game 5. Gray will go up against Detroit right-hander Justin Verlander who in Game 5 vs. the A’s last year put the Tigers on his back with a complete-game 11-strikeout effort that sent Detroit to the AL Championship Series. He also pitched seven shutout innings in Game 2 on Saturday. But Gray did Verlander one better compiling eight scoreless innings in Oakland’s Game 2 victory. He allowed four hits with only one leaving the infield and walked two in the affair which marked just the 11th start of his big league career. Oakland’s 2011 first-round Draft pick has a 1.85 ERA over his last seven outings and his ability to continue such an impressive trend could help the A’s buck a depressing one. The club enters Thursday’s contest 1-11 in potential clinch games since 1990.