The US Open Round of 16 is here, and Sunday's slate in New York features five matchups that span the full spectrum of intrigue, from a rivalry with a rich recent history to a genuinely wide-open first-ever meeting. With ranking gaps, head-to-head ledgers, and recent results all in play, here is what the data tells us heading into each contest.

Tommy Paul vs. Carlos Alcaraz - Round of 16

Scheduled for approximately 5:00 PM EDT.

Alcaraz leads the overall head-to-head 6-2, a margin that plainly establishes him as the dominant force in this rivalry. The five most recent meetings paint a nuanced picture, however. Paul has won two of those five, including a three-set victory at the National Bank Open in Montreal and another at the National Bank Open in Toronto. Alcaraz answered with wins in Miami, Cincinnati, and Wimbledon, the latter a four-set result of 5-7, 6-4, 6-2, 6-2 that demonstrated his ability to weather an early set loss. The ranking gap, Alcaraz at No. 2 and Paul at No. 28, is substantial, but the recent record shows Paul is capable of taking sets and full matches off the world's second-ranked player. No odds are available to sharpen the expectation further. This should be a competitive match, though Alcaraz's overall record and ranking advantage make him the more reliable pick.

Prediction: Carlos Alcaraz in four sets.

Daniil Medvedev vs. Frances Tiafoe - Round of 16

Scheduled for approximately 6:00 PM EDT.

Medvedev leads this head-to-head 6-2, and the recent results are particularly telling. Four of the five most recent meetings went to Medvedev, including a dominant 6-4, 6-1, 6-0 result in the Round of 16 at this very tournament and a 6-4, 6-3 win in Miami. Medvedev also took a 6-2, 7-5 decision in Washington. The lone Tiafoe win in the recent sample came in Nice with a 6-3, 6-2 scoreline. Tiafoe, ranked 26th, sits 18 spots below Medvedev at No. 8. The US Open hard court has been a particularly unfriendly surface for Tiafoe in this head-to-head, given the lopsided result the last time they met at Flushing Meadows. No odds are available, but the combination of Medvedev's overall ledger, recent form in the head-to-head, and ranking advantage all point clearly in one direction.

Prediction: Daniil Medvedev in four sets.

Alexander Zverev vs. Luciano Darderi - Round of 16

The head-to-head is knotted at 1-1, and the context behind that split is striking. Both meetings took place at the same tournament, the Internazionali BNL d'Italia in Rome, and in the same year. Zverev won their first encounter 7-6(3), 6-2, and then Darderi came back to win 1-6, 7-6(10), 6-0 in a wild reversal. The rankings favor Zverev at No. 3 versus Darderi at No. 18, a considerable gap. With only two prior meetings and no odds available, there is not enough data to read deeply into tendencies, but the ranking differential is meaningful and Zverev's position just outside the top two makes him the clearer favorite on paper.

Prediction: Alexander Zverev in four sets.

Karen Khachanov vs. Learner Tien - Round of 16

This is a genuinely novel matchup. Khachanov and Tien have never met on tour, leaving no head-to-head record or recent results to analyze. Khachanov is ranked 15th and Tien 19th, making this the closest ranking matchup on the day's featured slate. With no odds available and no prior meetings to reference, there is little data from which to draw firm conclusions. The modest ranking edge belongs to Khachanov.

Prediction: Karen Khachanov in four sets.

Ben Shelton vs. Stefanos Tsitsipas - Round of 16

Shelton, ranked fifth, enters as a heavy favorite on paper against Tsitsipas, who has fallen to 84th in the world. The one prior meeting went to Tsitsipas in two tight tiebreak sets, 7-6(3), 7-6(2), in the Western and Southern Open in Cincinnati. That result is worth noting, as it shows Tsitsipas can compete closely with Shelton when the margins are thin. The ranking gap between the two is the widest of any matchup on today's slate. No odds are available to quantify expectations further, but the combination of Shelton's fifth-place ranking and Tsitsipas's current standing at 84 makes this a significant mismatch by that measure.

Prediction: Ben Shelton in three sets.