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

#3 Roger Federer (17th appearance)

Roger Federer

Record-six time ATP Finals champion Roger Federer booked a record-extending 17th trip to the season-ending event after winning his US Open first round match against Sumit Nagal.

The Swiss maestro started his 22nd season on tour with a fourth round exit against Stefanos Tsitsipas in the fourth round of the Australian Open. Federer then became the second player in the Open Era to win 100 singles titles, when he beat his Australian Open conqueror in the title match in Dubai.

Federer fell in the Indian Wells final for the second consecutive year, losing to Dominic Thiem, but landed his first Masters 1000 title since 2017 Shanghai with a win over defending champion John Isner in Miami.

The 20-time Grand Slam champion entered the clay swing of the tour for the first time in four years, reaching quarterfinals at the Madrid and Rome Masters. He then made his first Roland Garros semifinal in 7 years, where he fell to familiar nemesis Rafael Nadal.

The Swiss legend won his first double-digit title haul of his career on the grasscourts of Halle before squandering two championship points on serve in the fifth set of a historic Wimbledon final against Novak Djokovic, which featured the first fifth set tiebreaker in tournament history.

Federer endured early exits at Cincinnati (third round), US Open (quarterfinals), and Shanghai (quarterfinals) before winning a 10th title in his hometown tournament in Basel.

Apart from most appearances (17) and most titles (6) at the ATP Finals, Federer holds a few other records at the season-ending tournament. The Swiss star's 57 match wins is miles ahead of the next best mark of Ivan Lendl's 39. His 10 finals, 15 semifinals, 72 matches at the ATP Finals are also unmatched by any other player.

#4 Daniil Medvedev (debut appearance)

Daniil Medvedev

Daniil Medvedev became the fourth player to qualify for the 2019 ATP Finals, after beating Stan Wawrinka in the US Open quarterfinals.

Earlier in the season, following a run to the Wimbledon third round, the young Russian followed compatriot Karen Khachanov in debuting in the top 10 of the ATP rankings. Weeks later, on the north American hardcourts, Medvedev went on a tear.

The 23-year-old reached finals at Washington DC (lost to Nick Kyrgios), Montreal Masters (lost to Rafael Nadal), and Cincinnati Masters (beat David Goffin) in the space of three weeks.

Medvedev then reached his first Grand Slam final at the US Open, where he recovered from a two-set and a break deficit and squandered multiple break points in the fifth set of a titanic title match at Flushing Meadows before going down to Rafael Nadal.

Two more tournament finals followed, where Medvedev won in St. Petersburg followed by a second Masters 1000 title in Shanghai, before he lost in the opening round in Paris.

Medvedev will be the fourth Russian player to play at the ATP Finals, and the first since Nikolay Davydenko in 2009.

#5 Dominic Thiem (4th appearance)

Dominic Thiem

Dominic Thiem became the fifth player to qualify for the 2019 ATP Finals, following a run to the final in Beijing.

Thiem has had a career-best season in 2019, winning his first Masters 1000 title on the hardcourts of Indian Wells (beat Roger Federer) before defeating Rafael Nadal in the Barcelona semifinals en route to his first clay title of the season.

Thiem beat Novak Djokovic in a five-set semifinal to return to the Roland Garros final, where he took a set off Nadal. The 26-year-old won his maiden title on home soil in Kitzbühel, either side of first-round exits at Wimbledon (Sam Querrey) and the US Open (Thomas Fabbiano).

The Austrian won his fourth title of the year in Beijing before triumphing for the first time in Vienna, for his second title in his native country. That marked the first time Thiem won five titles in a season, also becoming the first player in 2019 to do so.

In each of his 3 previous campaigns at the ATP Finals Thiem won once and lost twice, failing to progress beyond the group stage.