When No. 2 and No. 3 on the ATP rankings are about to clash for one of the biggest titles of the year, there are always a lot of stats and records to keep an eye on.

Here are 10 of them:

We’re guaranteed a 10th multiple ATP Finals champion on Sunday. Daniil Medvedev (2020) and Alexander Zverev (2018) are both one-time champions at the ATP Finals, and one of them will become the 10th man to win the event multiple times after Roger Federer (6), Novak Djokovic (5), Pete Sampras (5), Ivan Lendl (5), Ilie Nastase (4), Boris Becker (3), John McEnroe (3), Lleyton Hewitt (2) and Bjorn Borg (2).

Fun fact: All nine of those men were, had been or would become No. 1.

Medvedev and Zverev are tied for the most tour-level wins this year. That’s not just for the men, that’s for men OR women—they both have 58 wins on the season going into the final (Medvedev is 58-12 this year, while Zverev is 58-15).

Medvedev has won their last five meetings, including right here five days ago. Zverev was two points from winning their round robin match on Tuesday, but Medvedev ultimately claimed a 6-3, 6-7 (3), 7-6 (6) victory. The Russian has now beaten the German five straight times and leads the overall head-to-head, 6-5.

Zverev’s last win over Medvedev came in the round robin of this event in 2019.

This is the 19th time in ATP Finals history that two players will have a rematch in the final after having played each other in the round robin—and more often than not, revenge happens. In the previous 18 times this has happened, the loser of the round-robin match has won the final rematch 10 times, most recently Zverev himself in 2018, losing to Djokovic in the round robin and then beating the Serb in the final.

Medvedev is on a nine-match winning streak at the ATP Finals. He went 5-0 to win the title last year and is 4-0 so far this year—he’s also won 23 of his last 25 matches on indoor hard courts, which dates back to the beginning of Paris last fall.

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Medvedev just beat Zverev in the round robin five days ago—but Zverev was two points from winning that one.

Medvedev just beat Zverev in the round robin five days ago—but Zverev was two points from winning that one.

Zverev is 5-0 in finals this year. He won Acapulco, Madrid, the Olympics, Cincinnati and Vienna, and he actually won four of those five finals in straight sets—Matteo Berrettini is the only player to take a set off of Zverev in a final this year, pushing him to a 6-7 (8), 6-4, 6-3 scoreline in Madrid (and Zverev had a set point in that first set).

Medvedev has won 8 of his last 10 finals. Since (barely) finishing runner-up to Rafael Nadal in the 2019 US Open final, the Russian has gone 8-2 in finals, winning St. Petersburg and Shanghai in 2019, Paris and the ATP Finals in 2020 and Marseille, Mallorca, Toronto and the US Open this year (the only two losses in that stretch came at the Australian Open and Paris this year, and both to Djokovic).

Zverev, who beat No. 1 Djokovic in the semis, is trying to become just the fourth player in ATP Finals history to beat the Top 2 players in the last two rounds. Only Lendl (1982), Stefan Edberg (1989) and Andre Agassi (1990) have done that.

Medvedev, who won this title in London last year, is trying to become only the third man ever to win back-to-back ATP Finals titles in different cities. Only Nastase (Paris in 1971, Barcelona in 1972 and Boston in 1973) and Hewitt (Sydney in 2001 and Shanghai in 2002) have successfully defended the title in a new city.

Zverev is going for his tour-leading sixth ATP title of the year. He’s currently tied for the most with five—Djokovic and Casper Ruud have five as well. Medvedev has four and could make it a four-way tie at five to finish the year if he wins on Sunday.