Defending women's champion Sofia Kenin was knocked out in straight sets by Kaia Kanepi of Estonia ©Getty Images

The defending champion in the women’s singles Sofia Kenin was dumped out of the Australian Open today after being beaten in straight sets in her second round match against Estonia’s Kaia Kanepi.

The American was comprehensively defeated on the Margaret Court Arena, with her 6-3 6-2 loss to Kanepi, ensuring there will be a new name on the trophy this year.

Despite Kenin’s loss, the other top seeds in the women’s draw enjoyed comfortable wins in their second round matches.

In an all Australian affair top seed Ashleigh Barty beat wildcard Daria Gavrilova 6-1 7-6, while fifth seed Elina Svitolina of Ukraine beat American teenager Coco Gauff 6-3 6-3.

Elsewhere, sixth seed Karolina Pliskova of the Czech Republic beat American Danielle Collins 7-5 6-2 while 11th seed Belinda Bencic of Switzerland was made to work harder for her win, triumphing in three sets 7-5 2-6 6-4 against Russia’s Svetlana Kuznetsova.

In the men’s singles draw, the match of the day pitted the fifth seed Stefanos Tsitsipas of Greece against Australian wildcard Thanasi Kokkinakis.

Despite losing two sets on tie-breaks Tsitsipas battled through 6-7 6-4 6-1 6-7 6-4 in just over four and a half hours.

Stefanos Tsitsipas of Greece celebrates after a five-set win over Australian qualifier Thanasi Kokkinakis ©Getty Images
Stefanos Tsitsipas of Greece celebrates after a five-set win over Australian qualifier Thanasi Kokkinakis ©Getty Images

The other top seeds in the men’s draw enjoyed comfortable wins with second seed Rafael Nadal of Spain overcoming American qualifier Michael Mmoh 6-1 6-2 6-4.

Despite the contest being straightforward on court, there were difficulties off court with the match interrupted by a rowdy spectator who shouted obscenities and gestured rudely in Nadal’s direction, before being removed by security staff.

Fourth seed Daniil Medvedev of Russia was also a straight sets winner as he beat Spain’s Roberto Carballes Baena 6-2 7-5 6-1.

Seventh seed Andrey Rublev of Russia triumphed in three close sets as he overcame Brazil’s Thiago Monteiro 6-4 6-4 7-6, while ninth seed Matteo Berrettini won in four sets 6-3 6-2 4-6 6-3 against a qualifier from the Czech Republic Tomáš Macháč.

One of the liveliest matches of the day was an all-Italian affair between 16th seed Fabio Fognini and Salvatore Caruso on the John Cain Arena.

Fognini triumphed in five sets 4-6 6-2 2-6 6-3 7-6, as he won the deciding set tiebreak by 14 points to 12.

That was not the end of the drama as following a handshake when Fognini reportedly told his opponent he was "lucky" to have been involved in such a close contest, the pair had an angry exchange at the net.

After shouting and gesticulating between the pair, an official was forced to separate the players in order to calm the situation.