Platoons in Arizona?

Chad Tracy will start in place of Mark Reynolds at third base, and Eric Byrnes will get the nod over Justin Upton for the Diamondbacks in their opener against Colorado. Bob Melvin says it's a move to get the D'Backs best lineup on the field on a game-by-game basis.

"The only message we're sending is we're trying to run the best lineup out there on a particular day," he said. "They know that. We've addressed it. There's no hidden messages for anybody. It's about winning, and everybody's on board with that."

Melvin wanted Clark in the lineup because he is a switch-hitter, and Colorado Rockies right-hander Aaron Cook has never handled left-handed hitters as well as right-handers.

Tracy also has played better than Reynolds defensively in spring training, a factor that could come into play more with Brandon Webb, an extreme ground-ball pitcher, on the mound.

As for right field, Byrnes is 7 for 23 (.304) and Upton 1 for 9 (.111) in their careers vs. Cook. Byrnes also looked much better than Upton at the plate in spring training.

Fantasy Impcact: OK, but that sounds like a potential platoon situation at both positions. Arizona has four outfielders capable of starting with Connor Jackson, Chris Young, Upton and Byrnes. They've also got Tracy capable of playing both first and third. If this keeps up, Reynolds and Upton's fatnasy value falters from starters to part-time players. Tracy's value improves as a potential full-timer at two positions. The article does explain that Reynolds and Upton are expected to be in the lineup on both Tuesday and Wednesday.