The United States' Caruana drew the first game before Jumabayev got the better of him in the second to produce the biggest surprise of the tournament so far.

Caruana was widely expected to progress deep into the competition but instead has to suffer the ignominy of a third-round exit.

In the 30th move of the game, Caruana offered a draw to Jumabayev but Kazakhstan’s best player knew he had the advantage and declined before going on to secure victory.

Jumbayev is not letting the giant-killing get to his head.

"I’m only thinking about the next game," the 31-year-old said.

"I suppose if I do my best I will have a chance."

World champion Magnus Carlsen ground out a second win of the International Chess Federation event, beating fellow Norwegian Aryan Tari to advance to the fourth round.

Tari had some of the better defensive chances during today's second game but Carlsen’s technique proved to be too much and Tari had to resign on move 67.

Thirteen third-round matches have gone to tiebreaks, which will be played tomorrow.

Uzbekistan's Javokhir Sindarov is among those waiting to find out their opponent, after the 15-year-old beat Peru's Jorge Cori.

In the FIDE Women's World Cup - which is also being held in the Russian city - top seeds Aleksandra Goryachkina and Kateryna Lagno of Russia and Ukraine's Anna Muzychuk all drew their second games today and advanced to the next round.

Former World Champion Tan Zhongyi from China eliminated opponent Marie Sebag of France with a clear 2-0 result.

The same score was achieved by Georgian Nino Batsiashvili, who advanced to the next round at the expense of Pole Jolanta Zawadka to set up a round-of-16 duel with Russian grandmaster Valentina Gunina.

The top two finishers in the open World Cup, aside from Carlsen, will qualify for the 2022 Candidates Tournament.

The winner also gets $110,000 (£80,500/€93,000) in prize money, with the runner-up collecting $80,000 (£58,500/€67,000).