The problem seemed to come that once MY played his way out of his passive style and stop making UEs, Murray had no real answer. He stopped stepping into the serve and crashing returns back at the Russian. Once again he became too comfortable and when he had to step up a gear in the second set he found his shots started to break down. First it was the forehand at the beginning of the set, and then the backhand. Yes he got a dodgy decision at set point but to be quite honest by then there only looked like one winner anyway. Murray stopped making an impression on the Youhzny serve and MY started to win one or two more points on the Murray first serve.
As has been said there were a couple of chances of an immediate break-back but MY served very well on the crunch points.
http://news.bbc.co.uk/sport1/hi/tennis/7032716.stm - match report is already on BBC, it seems ;)
I just thought I'd post the above comment for posperity. It was finished at 30-0 on Youhzny's serve. Then I waited until the end of the game to see whether it was necessary. Hopefully Andy can produce a slightly better ending paragraph to it!!