That was very important for Andy to win the 1st set. He fell behind twice in the TB but came back both times and the last time he was able to hold his serve and that led him to the set point 6-5 and then the miss by Sam at the net.
While Sam has more winners he also has more errors. He's going all out today against Andy and playing a very high risk game. Andy himself played a few points quite rubbish but was able to make amends just in time. Good match so far.