BABBLELOT - why would Djokovic donate games in the first set or tank it?
Fatigue, both mental and physical. Conserve energy for a 3 setter now that you're already down a double break to Roger Federer.
Conventional wisdom accounts for Murray's poor 1st set performances by labelling him a slow starter. What is this, a 100 meter dash? The dude gets down and lolligags through the first set then beats you in 3.
Nole didn't serve up his 4th DF at the end of the 1st set then "adjust" to Roger's aggressive style of play. He tanked the set at the end then determined to take the match the distance.
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