Meet the 8-man field for the 2019 ATP Finals in London

#6 Stefanos Tsitsipas (debut appearance)

Stefanos Tsitsipas

Stefanos Tsitsipas became the sixth player to qualify for the 2019 ATP Finals after the young Greek reached the Shanghai quarterfinals (beat Novak Djokovic).

Tsitsipas opened the season by dethroning two-time defending champion Roger Federer in the fourth round of the Australian Open en route to a maiden Grand Slam semifinal (lost to Rafael Nadal). The young Greek won his second career title in Marseille (beat Mikhail Kukushkin) before being the losing finalist in Dubai where Roger Federer won his 100th career title.

After becoming the first Greek player to debut in the top 10 of the world rankings, a win over Pablo Cuevas in the Estoril final gave Tsitsipas the third title of his career, second of the season, and first on clay. The 20-year-old then upset Rafael Nadal in the Madrid Masters semifinal to reach his second Masters 1000 final (lost to Novak Djokovic).

Following a spate of first-round exits (Wimbledon, Montreal, Cincinnati, US Open), Tsitsipas reached his 5th final of the year in Beijing (lost to Dominic Thiem). That was before he upset top seed Novak Djokovic in the Shanghai Masters quarterfinals.

The young Greek recorded the 100th singles win of his career following a third-round victory over Alex De Minaur in the Paris Masters.

At the 2019 ATP Finals in London, Tsitsipas will be the first Greek player ever and the second debutant in the tournament, Daniil Medvedev being the other.

#7 Alexander Zverev (3rd appearance)

Alexander Zverev

The defending ATP Finals champion left it late to qualify for his third appearance at the ATP Finals. He sealed his spot in London following a third-round in Paris coupled with a spate of other contenders falling in the second round.

Alexander Zverev did not reach a tour final in the season till Geneva, where three successive three-set wins and two saved championship points against Nicolas Jarry in the final enabled him to clinch the 11th singles title of his young career.

Two five-set wins in the first three rounds propelled Zverev to a second consecutive Roland Garros quarterfinal, where he went down to Novak Djokovic. Following an opening-round exit at Wimbledon, Zverev lost in the US Open fourth round to Diego Schwartzman before scoring Team Europe's title-clinching win at the Laver Cup.

The 22-year-old squandered five match points in the second set of the Shanghai quarterfinal before downing two-time champion Roger Federer in three sets. Zverev lost to Daniil Medvedev in the former's first Masters 1000 final of the season.

After an opening-round exit in Basel and a third-round showing in Paris, Zverev returns to the venue of his greatest triumph.

Zverev beat Federer and Djokovic in successive matches in 2018 to become the youngest ATP Finals champion in 10 years, after going 1-2 in round-robin play on his debut in 2017.

#8 Matteo Berrettini (debut appearance)

Matteo Berrettini

A career-best season saw Matteo Berrettini reach a maiden Grand Slam semifinal (lost to Rafael Nadal at the US Open) and become only the fourth Italian player in history to ascend to the top 10 of the world rankings. Adriano Panatta (1976), Corrado Barazzutti (1978) and Fabio Fognini (2019) were the others.

Berrettini won titles in Budapest and Stuttgart, lost in the Munich final, and reached a maiden Masters 1000 semifinal in Shanghai (lost to Alexander Zverev).

Going into the last regular tournament on the calendar, the Paris Masters, 9 players were in contention to seal the two remaining spots for London. A spate of second-round exits saw defending champion Zverev book his ticket to the British capital.

Despite losing in the second round himself, Berrettini led a group of 3 other players - Gael Monfils, Stan Wawrinka, and Alex de Minaur - for the final spot in London. Wawrinka and De Minaur's ousters meant that the final spot in London became a direct tussle between Berrettini and Monfils.

Needing a win over Denis Shapovalov in the quarterfinal to usurp Berrettini and book his second trip to the ATP Finals, Monfils fell to a straight-set defeat against the young Canadian.

In the process, Berrettini followed his illustrious compatriots Panatta and Berazzutti to become the third Italian player to qualify for the ATP Finals.