What mercurial command can you use to see the changeset prior to changeset xyz?

If you do hg log -r :xyz you see all the changesets prior to (and including) xyz - listed in ascending order. But I'd like to easily see just the prior changeset.

Update: Really what I'm after is: If I do an hg fetch, what command can I use to see the changeset PRIOR to the the changesets that were pulled in by the fetch?

hg log -r :xyz where xyz is the first changeset pulled in by the fetch works but it returns the entire list of prior changesets where I just want the most recent.