PARIS (AP) — From a tiff with the chair umpire to the big deficit he created and then needed to overcome in a steady rain, Novak Djokovic had an all-around difficult day at the French Open.

Rafael Nadal’s journey to the fourth round, in contrast, could hardly have been easier. Indeed, his 100th best-of-five-set match on clay was also the most lopsided.

The stark numbers on the scoreboards at Court Philippe Chatrier revealed plenty about how differently things went in the back-to-back contests Friday for defending champion Djokovic and nine-time champion Nadal. 

Djokovic followed in the main stadium and found himself in quite a bit of trouble right away against 41st-ranked Diego Schwartzman before emerging to win 5-7, 6-3, 3-6, 6-1, 6-1.

Schwartzman played well during that stretch, to be sure, but the No. 2-seeded Djokovic’s biggest problem was himself. He wound up with 55 unforced errors to 43 winners, and all sorts of issues on his backhand wing, which produced 33 of those miscues, all under the watchful eye of new coach Andre Agassi.

Djokovic, who completed a career Grand Slam a year ago in Paris, eventually managed to figure out how to steady his game, if not his demeanor.

As Schwartzman became less proficient and complained about issues in his right hip area — a trainer came out and gave him a massage during a changeover late in the final set — Djokovic became more assertive and more accurate.

Still, there were distractions.

In the fourth set, with Djokovic leading 4-0 and serving at 30-all, he was given a fault by chair umpire Carlos Ramos for multiple time violations. After the ensuing point, Djokovic stared in Ramos’ direction. Moments later, just about to face a break point, Djokovic yelled at himself, mostly in Serbian. Then, facing Ramos, Djokovic briefly lifted his racket overhead, before using it to flip a ball backward toward a ball boy.

That’s when Ramos interrupted, announcing a code violation warning for unsportsmanlike conduct. Djokovic walked over and barked: “What’s wrong with you? What did I say? What did I say? What did I say? Why did you give me warning? What, do you understand Serbian?”

Ramos had trouble getting a word in edgewise, but he responded: “Because of what you did. The gesture you made with the racket. This is not acceptable.”

Djokovic: “Did I hit the ball in your direction?”

Ramos: “No, you did not.”

Djokovic: “Did I hit it? Why did you give me a warning?”

Ramos: “Because of your attitude.”

Djokovic: “What attitude, man?”

When play resumed, Djokovic missed a forehand to drop that game. He would win 8 of 9 games the rest of the way.