Lots of rumors floating around about an alleged "lengthy discussion" between Fed & Stanimal after the SF in London.
Supposed igniter was Fed's wife talking trash during the match + Swiss DC coach sitting in the Fed box. Interesting as I am sure books will spin this into a betting angle.
http://www.dailymail.co.uk/sport/tennis/article-2837796/Stan-Wawrinka-argued-Roger-Federer-O2-Arena-hearing-wife-world-No-2.html