Novak Djokovic has confessed that he may have already played the Madrid Open for the final time after suffering a shock defeat to Matteo Arnaldi. The world No. 5 has now lost in the opening round in four of his last five tournaments, a far cry from the days of dominance when he would go on 40-plus-match winning streaks.

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On Saturday, the 4-seed Djokovic took on unseeded Matteo Arnaldi in their first-ever meeting. Arnaldi defeated Djokovic in straight sets during their second-round match at the Madrid Open: 6-3, 6-4.