'Like an imposter': Tennis star's 'awful' meltdown continues at ATP Cup

Alexander Zverev's Australian Open preparations are in disarray.

Smashed racquets, on-court meltdowns and three defeats from three matches, the ATP Cup in Brisbane has been a tournament to forget for Zverev.

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The German world No.7's preparations for the year's first grand slam are in tatters as he slumped to a 6-2 6-2 loss to Canada's Denis Shapovalov on Pat Rafter Arena on Tuesday.

While the defeat didn't contain the explosions of frustrations from his earlier matches, the performance was just as insipid for such a highly-touted player.

Alexander Zverev has lost three matches out of three at the ATP Cup in Brisbane. Pic: Getty

It seems a long time since he opened the tournament by claiming the first set of his clash with Australia's Alex de Minaur on Friday.

De Minaur roared back to take the match 4-6 7-6 (7-3) 6-2, with Zverev smashing his racquet to pieces at the end of the second set.

The 22-year-old's game was just as broken as his racquet from that point onwards, ending the match with 14 double faults.

On Sunday he served up another 10 double faults as he was defeated 6-1 6-4 by Greek star Stefanos Tsitsipas.

German’s confidence appears at an all-time low

Zverev's frustrations were once again evident in the clash with fellow top 10 player Tsitsipas, often arguing between games with Germany captain Boris Becker and his teammates.

Germany captain Boris Becker would be concerned by the form of star player Alexander Zverev. Pic: Getty

Tuesday's clash with Shapovalov was little better, with seven double faults and quite often knocking 50km/h off his second serve in an attempt to get the ball in play.

Viewers were quick to show their concern for Zverev's worrying dip in form and apparent lack of confidence in his serve.

A former world junior No.1, Zverev has been tipped for greatness since winning the ATP Finals in London in 2018.

Despite his talent however, his best grand slam result is a pair of quarter-final appearances in the French Open, while his fourth-round exit at last year's Australian Open is his best result at Melbourne Park.

Given how he's played over the past week in Brisbane, it appears unlikely Zverev will be bettering that result in 2020.

With AAP