Mirka Federer has divided social media over her actions towards Nick Kyrgios.

Australia’s most notorious men’s tennis player, Nick Kyrgios, was no crowd-favourite when he met with Roger Federer at the Miami Open semi final overnight.

The 21-year-old put up a fight, with 35-year-old Federer taking three hours to claim the 7-6 (11-9) 6-7 (11-9) 7-6 (7-5) victory.

Tensions really started to flare during the match when Kyrgios forced a delay, taking ample time to walk over to his seat to change racquets. And among the noisy, irritated onlookers was none other than Mirka Federer, former tennis pro and wife of Roger.

You can watch what happened below:

While social media was buzzing over Kyrgios’ usual antics, there was another undertone: heckling her husband’s opponent was an ‘unclassy’ and unsportsmanslike display.

Low class move from Mirka Federer whistling at Kyrgios, has always been rude, glad cameras caught her #ATPMiami #Kyrgios #Federer pic.twitter.com/hioX9wAAJ5

— Beston and Greenway (@BestonGreenway) 1 April 2017

This isn’t the first time the 38-year-old has been involved in such controversy. In 2014, it was reported her husband and Swiss compatriot Stan Wawrinka were embroiled in a 10 minute row over her attitude courtside.

“It is understood that Mirka’s intense and even provocative support for her husband… caused Wawrinka to complain about her behaviour,” The Sydney Morning Herald reported at the time.

When Federer and Wawrinka faced off at the Barclays ATP World Tour Finals earlier that day, Wawrinka complained to the chair umpire that, “Every time I’m on their side, she mouths off before the serve. It’s insufferable.”

Audio from that match features the words “Cry baby” – coming from a female voice – moments later.

So – is heckling your husband’s opposition during a heated tennis match really a “low class move”, as the tweets would suggest?

That, sweet reader, is for you to decide.