Roger Federer
2018 record: 46-8; career record vs. group: 12-5; career record at ATP Finals: 55-13
Federer, who reached the semifinals in London last year, can’t catch Djokovic for No. 1, but he could pass Nadal for No. 2. He certainly has the experience advantage over his group-mates: Federer has played this event every year since 2002, with the exception of his injury-shortened 2016. With his recent title in Basel, and his semifinal run at Bercy, the 37-year-old also happens to be playing some good tennis at the moment. Still, his 12-5 record against his round-robin competition isn’t quite as one-sided as we might expect from him. Federer is just 1-2 against Thiem, and he lost to Anderson in the quarterfinals at Wimbledon. It will be interesting to see him try to get the better of those two this time around. He probably will.
Dominic Thiem
2018 record: 53-18; career record vs. group: 5-10; career record at ATP Finals: 2-4
The fact that Thiem is still standing, and even thriving, at this late stage of the season should probably be considered progress. In past years, the hardest-working man in pro tennis has typically faded down the stretch. Not in 2018: This fall, he has reached the quarterfinals at the US Open, won a tournament in St. Petersburg, won two Davis Cup matches for Austria, and reached the semifinals at Bercy. At 25, with a Roland Garros runner-up finish on his résumé, this would seem to be the year for Thiem to advance past the round-robin stage in London for the first time.
Kevin Anderson
2018 record: 45-17; career record vs. group: 10-11; career record at ATP Finals: 0-0
Anderson is the neophyte in this group; he’s making his ATP Finals debut at the unlikely age of 32. Will the dip into uncharted waters have an effect? Possibly. The cerebral South African doesn’t gravitate toward the spotlight, and he never found anything close to his A game in his first US Open final last year, or in his first Wimbledon final this summer. As far as his record against his group-mates, though, Anderson should be ready. He’s nearly .500, he has a 6-2 record against Thiem, and he beat Federer at Wimbledon. At 6’8”, with a serve to match, he should also like the controlled conditions at the 02. Both of Anderson’s titles in 2018, in Vienna and on Long Island, came on indoor hard courts. His run in Vienna also included wins over Nishikori and Thiem.
Kei Nishikori
2018 record: 42-19; career record vs. group: 10-11; career record at ATP Finals: 4-7
Nishikori’s return from injury in 2018 hasn’t been quite as spectacular as Djokovic’s, but it has been impressive nonetheless. He’s qualified for his fourth ATP Finals despite missing the Australian Open and Indian Wells at the start of the year. To make it, Nishikori played some of the best tennis of his career over the second half of the season, reaching the semifinals at the US Open and finals in Tokyo and Vienna. While his 4-7 record in London might not sound auspicious, it has been enough to advance him to the semis in two of his three appearances there.
Semifinalists: Federer, Thiem