VIDEO: Janowicz and Hamou's awkward post-match handshake

Now this was one awkward post-match handshake.

Jerzy Janowicz aggressively grabbed opponent Maxime Hamou's hand when they met at the net after the Pole's 6-7 (4), 6-3, 6-4, 6-4 win at the French Open.

Then each player pointed at the other, exchanging glares.

And Janowicz, a Wimbledon semifinalist in 2013, offered an etiquette lesson, too.

He was steamed that Hamou had failed to offer an apology after hitting a return right at Janowicz even though a serve had been called out.

''I said, 'You're supposed to say sorry,''' Janowicz recounted later.

He said Hamou didn't reply.

For his part, Hamou denied he aimed at Janowicz on purpose, noting: ''He had plenty of time to avoid it.''