"A bit of a tight hamstring" is generally a DL stint. I experienced this myself 2 weeks ago running the bases. I didn't actually start to feel anything until well after the game, and it was just a slight feeling of tightness. I could barely walk the next 2 days, and I still can only run about 60% full speed two weeks later.
People underestimate hamstring injuries, mainly because the symptoms are far milder than the actual damage. The muscular tissue literally separates itself from the bone, and all you might feel is a slight pinching sensation, but that s*** doesn't heal itself in just a few days.