Victor Matfield sat down with The Rings History Pod to name the opponents who made his weeks genuinely uncomfortable — and the list is more revealing than a simple greatest-hits countdown. Collins gets respect for his physicality and honesty, Ali Williams for turning lineout chess into a genuine contest that Matfield admits he didn't always win. O'Connell earns a special mention not for any single moment but for the slow psychological grind — Matfield describes standing opposite him wondering exactly how much the Irishman already knew about South Africa's lineout calls. McCaw's entry centres less on breakdown dominance and more on his almost supernatural ability to read each referee's threshold and operate right at its edge, week after week. But the piece's most interesting verdict is reserved for Simon Shaw, who Matfield crowns his most awkward opponent. Shaw's combination of size, experience and joyless professionalism — he wasn't trying to look good, just make your afternoon miserable — made him uniquely difficult to prepare for, and Matfield is explicit that players always know who forces them to change their preparation even if the wider public doesn't. That 2009 Lions second Test at Loftus, bodies everywhere, five Lions hospitalised, is the backdrop Matfield uses to explain exactly why Shaw belongs at the top.