Not dismissing the heat factor, different people deal with it/are affected by it differently but the heat didn't beat Bouchard in this match.
She was outplayed. And she's a bit of a drama queen, don't you think? Just setting up the excuses, which she continued to propogate later when she said she had no expectations for the U.S. Open.
What's happened to all her supposed focus and toughness and all that we heard about early this season when she was having success? Let's get real here; she has benefited from the way draws have broken for her (though granted, one can only play the person in front of you) and of late continues to lose to lower-seeded players. She is not, at least not yet, as good as her ranking would suggest.
Nor is Milos Raonic, exposed again as essentially a one-trick pony (big serve) in his U.S. Open loss. Maybe two tricks. Serve, and tiebreaker wins.
Well, both are still young. We'll see how it goes. The dominant men and women at the top of the ladder at present will eventually fade, so both Raonic and Bouchard may ascend. But right now? Expectations have way overtaken reality, at least in Canadian media reports, about Bouchard and Raonic. Both players of late are losing to lower-ranked opponents. So let's keep things in perspective.