There are instances in which on-court opponents refuse to shake each other's (or one the other's) hand after a particularly contentious match. (Tomas Berdych against Nicolas Almagro at the 2012 Australian Open springs to mind.)
Chair umpire refuses to shake Malisse's hand post-match
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Chair umpire James Keothavong forgoes the customary handshake aft
Published Jun 13, 2013