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Not many players can claim to have given Jurgen Klopp's Liverpool a torrid time during the German's near nine-year Anfield reign.
Harry Kane, Sergio Aguero and Jamie Vardy are among the select few strikers who have repeatedly troubled the Reds' backline since October 2015, though Kane and Aguero have since moved on and Vardy is now operating at Championship level.
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But the one man above all who has appeared hell-bent on giving Klopp post-match nightmares ever since arriving in England five years ago is none other than Arsenal's Gabriel Martinelli.
The Brazilian first faced off against Liverpool in a Carabao Cup fourth-round tie at Anfield in October 2019, scoring twice in a game which ended 5-5 before Klopp's side prevailed on penalties.
Taken aback by the display he had just witnessed, the Reds' boss labelled Martinelli as a "talent of the century" after the game before adding: "He's really unbelievable.
Perhaps it is no coincidence during Arsenal's below-par 2019/20 season, which saw the London club slump to an eighth-placed finish, the speedy winger was available for fewer than half of their Premier League fixtures.
The 22-year-old has since bounced back from this frustrating period and scored both home and away against the Reds last season, in addition to providing two assists for good measure.
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The explosive forward has scored more goals against Liverpool (5) than any other club in his career, making it clear to see why Klopp holds him in such high regard.
With six goal contributions in his previous seven Premier League outings prior to sustaining a foot injury against Sheffield United, the youngster has played a crucial role in his side regaining top spot in the division and there could yet be more to come.
After years of dazzling both Klopp and Trent Alexander-Arnold, Martinelli's final act before the former's Liverpool exit could be the worst yet: firing the Gunners to Premier League glory
For more news relating to Arsenal, visit our sister site AFC Latest Live.