To be more helpful:

    val roundLinks = Map(
        "700" -> Map(
            "group-a" -> "world-cup-2014-group-a"
        )
    )

Or fancier, something like

    val roundLinks = Map[String, Round => Option[String]](
        "700" -> (round: Round => round.name.map(s"world-cup-2014-${_.toLowerCase.replace(" ", "-")}"))
    )