If he didn't mark his man, Tadic would have had the ball, inside our box, under no pressure, great situation that. This isn't me bashing Skrtel, but he was the main culprit of the goal, him and Lucas (who should have tracked Clyne better)Lovren marked his man? Great, he marked his man and what happened next? People are seriously missing the wood for the trees on this point, like I said, it's collective, it's not just because Skrtel failed to close a gap, it's other players responsibilities too to react. Look at Gerrard standing ahead of that "gap", he too could have dropped in and closed the space.