Alexander Zverev will end 2026 as the world's number one men's tennis player after a season that delivered his first two Grand Slam titles and confirmed his long-awaited breakthrough at the highest level.
The 29-year-old became the oldest man in more than 50 years to reach the top ranking for the first time. His victories at the French Open and US Open provided the foundation for a season in which he also finished runner-up at Wimbledon.
Zverev had previously been regarded by many as the best male player never to win a major. Before 2026, he was already an Olympic champion, a two-time ATP Finals winner and a former world number two who had reached three Grand Slam finals.
His approach changed after spending 10 days with Rafael and Toni Nadal in Mallorca in July 2025. Zverev said he wanted to understand their view of tennis and learn from Rafael Nadal's experience of facing him over many years. He began the season determined to hit with greater speed, take more risks and add variety to his rallies.
There were still difficult moments, including cramping during the French Open final against Flavio Cobolli. This time, however, Zverev held his nerve in the deciding set, winning 6-1 to claim his first major title. He later produced his best tennis of the year at Wimbledon, where he lost to Jannik Sinner in four sets.
Zverev's results have also highlighted the challenge ahead. He has lost 10 consecutive matches to Sinner, while Carlos Alcaraz is another leading rival. If all three are fit at the beginning of next season, Zverev will be aiming to turn 2027 into a three-way contest for the major titles.
His success has been supported by his family. His father, Alex Sr, has remained a regular presence in his coaching box, while his older brother Mischa joined the team after retiring from professional tennis. Zverev has said that his relationship with his father works partly because they spend no time together away from the court.
Despite his achievements, Zverev's position as the sport's leading player remains contentious. In 2020, former partner Olga Sharypova accused him of physical violence and controlling behaviour. Zverev denied the allegations, and an ATP investigation completed by independent third-party investigators later reported that there was insufficient evidence to substantiate the published claims.
The ATP subsequently appointed a safeguarding director and launched a programme intended to establish a global framework for preventing and responding to abuse, harassment, bullying, domestic violence and other misconduct.
In 2023, a German court issued Zverev with a penalty order and a fine of 450,000 euros over alleged bodily harm against another former partner, Brenda Patea. Zverev denied the claims and challenged the order. The public trial in Berlin ended in 2024 before a verdict was reached after the court said there had been a settlement. The court stressed that the decision was not a verdict on guilt or innocence.
Zverev has also faced criticism over his conduct on court. In 2022, he received an eight-week suspended ATP ban after striking the umpire's chair four times with his racket following a doubles defeat at the Mexican Open. He apologised afterwards, and the suspension was not activated because he avoided a further penalty for similar behaviour during the following 12 months.
He was also heckled by spectators at tournaments in Australia and Munich in 2025 over the allegations. Zverev has maintained his denials, while his performances in 2026 have made him the clear statistical leader in men's tennis. His rise to number one therefore combines a landmark sporting season with unresolved discomfort surrounding his public record.
Sources: BBC Sport.