When you're playing a home team in the Olympics, expect the unexpected. That said, of the four doubles 'upsets' I'd say this is the only one that is a true surprise (barring the home Olympics rule): Cabal and Farah are a very good team; Venus Williams was ill playing a team with someone who won two GS doubles last year; and two top singles players (Tsonga/Monfils) do not a doubles team make.

Just out of interest, I haven't really been following, but scanning the results, is this a slow hard court? Seems as if teams/players that prefer slow are doing better than teams/players that prefer fast.

Yes, did seem on the slow side of medium slow to me. Very noticeable compared to some venues of varying pace recently. The ball just doesn't really go through but sits up.

Pity, particularly for Jamie, it was a pretty tough match but still very winnable match. But one of two results yesterday that I'd say clearly enhanced Andy's singles prospects, though the courts will undoubtably be slower than he'd like.

Novak was in bits after his match, but yes very gracious to Del Potro. Novak certainly one person for whom an Olympic title really did matter.