
Alexander Zverev’s 2018 ATP Finals victory in London marked his first triumph at the year-end tournament, a feat he repeated in 2021. En route to the title, the German defeated two of tennis’s biggest names, including Roger Federer in a dramatic semifinal.
The match hinged on a controversial second-set tiebreak, where a ball boy dropped a ball during play. Zverev paused the point, invoking the rules for a let, but the pro-Federer crowd at the O2 Arena reacted with boos during his post-match interview, unaware of the incident’s specifics.
Despite the backlash, Zverev won the tiebreak and the match, 7-5, 7-6, securing his path to the final. Federer later acknowledged the call’s difficulty, noting the ambiguity in real-time decisions, while Zverev downplayed the crowd’s reaction, emphasizing sportsmanship over controversy.

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