I.about [美 əˈbaʊt, 英 əˈbaʊt]副about often appears as the second element of certain verb structures in English (fool about, knock about, move about, etc). For translations, see the relevant verb entry (fool, knock, move, etc)
There's virtually nothing to knock about his game, not the opponents, not the clutch situations, and you certainly can't blame a guy for having a great group of blockers.