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Span is putting up strong numbers against right-handers (.305 batting average, .355 on-base percentage) this season, but those numbers plummet when he faces lefties (.154, .222).
Johnson doesn't necessarily intend to turn the Span/Hairston combo into a true righty/lefty platoon, but he believes the mere thought of the two sharing time could play to his advantage.
"I think [Span] will come out of it, but also I think it will send a message around the league that I will use Hairston in his spot," Johnson said. "It also causes some problems for the other managers. When they go to their bullpen in a lefty situation, I might use Hairston. That prevents them from doing that and enables Spanny to hit. So it just opens up more options and creates matchup problems for the other managers."