No zoom lens will really let you try macro photography, best to ignore it totally then get a dedicated lens like the Tamron 90mm when you can afford it - the lens design goals for a sports lens (fast focus, moderately fast aperture, good build) and a macro lens (slow focus, aperture stops down to f/32, sharpness absolute priority) mean that if you ever try to get a lens that can do both, it will be a compromise - no matter what third party manufacturers would have you believe when they slap Macro on every other lens they make.