Novak Djokovic was tennis’s immovable force–the man who turned Grand Slam draws into personal playgrounds and silenced stadiums with every improbable comeback.

Novak Djokovic has had a lengthy career of dominance. He's won every significant title and has the most Grand Slams of all time. But nothing lasts forever. The Serbian suffered a 6-3, 6-4 loss to Matteo Arnaldi at the Madrid Open on Saturday.

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.