Canadian star Denis Shapovalov will always remember his first Grand Slam main draw match. But so will many spectators in the crowd, and perhaps not for his play.

Shapovalov, who is the youngest player inside the ATP World Tour’s Top 200 and a junior Wimbledon champion, angrily disputed a line call during his four-set loss to Jerzy Janowicz.

Shapovalov was irate with the chair umpire on Court 7, when Janowicz stepped in, saying that the shot in question was on the line.

“Dude, don’t talk to me right now,” Shapovalov told Janowicz.

The Canadian wildcard was not thrilled with Janowicz’s interruption, explaining why fter his loss.

“He was complaining about a lot of line calls which I thought were correct so I didn't see why he needed to step in,” the 18-year-old told TSN. “I don’t know what he had to do with it.”

But Shapovalov did clarify that he and Janowicz are actually friends off the court, despite what it looked like.

It was not the first time that a match between the two has become noteworthy for more than their play. At the Guadalajara ATP Challenger in March, Janowicz received three code violations stemming from an argument with the chair umpire over line calls, which resulted in a game penalty early on in the second set. Shapovalov would win the match in three sets.

In Shapovalov’s defense, it is unclear whether or not he had a point during this particular argument on Monday—there is no Hawkeye technology on Court 7 to confirm line calls. But he did seem to be in good spirits later in the day, congratulating his compatriot Francoise Abanda on her first Wimbledon main-draw victory.

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