Is it my imagination but does Matosevic looked totally fed up! He is not even looking at Andy, quite rude.
It was a very brief handshake, after a pretty short match. As Sparkle says, it's just the timing of the photo - Matso looks at Andy, then looks away. It's shown in the lovely little highlights video here http://www.bbc.co.uk/sport/0/tennis/22898630