Quarters Preview
First Quarter: Rafael Nadal (1)
With no byes, all seeds are in action in round one. Nadal may have some tough names in this quarter, but he's dealt well with the majority of them. Nadal opens against fellow Spaniard Pablo Carreno Busta. The lefty has beaten his countryman twice, including one this season on hard courts and last year at this tournament. Expect a tussle, but Rafa should have enough confidence from those wins to get through. A win could net him a shot against another Spaniard with Nicolas Almagro or Daniel Munoz de la Nava slated to get the winner of Nadal-Carreno Busta. Rafa should feel comfortable with a 13-1 mark against Almagro in their careers.
In the bottom of this quarter, the seed is Belluci as the number eight. He has a difficult opener against Dolgopolov who has beaten him in both career meetings, although both were on hard courts. That will still be a potential upset in round one. The winner there goes against either qualifier Taro Daniel or Inigo Cervantes. Cervantes won their lone meeting over three years ago on clay at the Seville Challenger. The Spaniard is 1-2 on clay this season with losses to Carreno Busta and Santiago Giraldo. Having never played in Rio, Daniel could have a leg up in the opener. The Bellucci-Dolgopolov winner looks like a likely quarterfinalist in this section.
Second Quarter: Jo-Wilfried Tsonga (3)
Tsonga should have a chance to open strongly against Brazilian Thiago Monteiro, who is a wild card entry. Monteiro is a decent Challenger guy on this surface, but he hasn't won an ATP main draw match on clay in his career. Tsonga should be fine. The winner will go against Pablo Cuevas or qualifier Facundo Bagnis. Cuevas made the quarters in Buenos Aires and is 3-2 in Rio.
In the bottom of the quarter, sixth seed Jack Sock has a hard first round match-up against Federico Delbonis. Without a clay court match under his belt, Sock could be prone to an upset if he cannot get off to a quick start. The survivor of that match advances to take on either Marco Cecchinato or Paolo Lorenzi. Cecchinato is another one who is solid on the Challenger circuit, but 0-6 in ATP main draw matches on dirt. Lorenzi has good results on clay with a semifinal showing in Quito and a quarterfinal run last week in Buenos Aires. He's a dark horse in this quarter.
Third Quarter: John Isner (4)
An interesting quarter with Isner in one half and 7th seed Fabio Fognini in the other. Isner opens against Guido Pella. Pella can be tough on this surface and will likely get one of the usual Isner matches where the sets are decided late. An upset isn't that far fetched. The winner moves on to play Santiago Giraldo or qualifier Gastao Elias. Giraldo is 0-2 in Rio, but faced tougher competition those two times. Still, Elias is a vet and took a set from Buenos Aires champ Dominic Thiem last week. The qualifier might sneak through here.
Fognini starts his campaign in Ro against Aljaz Bedene. That is a great match-up for the Italian who is 6-0 against Bedene. Should he advance, Fognini might be in line to play Juan Monaco. Pico gets Daniel Gimeno-Traver in the first. Monaco and Gimeno-Traver have split four career meetings with none since 2013. Monaco looked okay last week in Buenos Aires after being out for nearly six months due to wrist surgery. It might be tough, but Monaco should just edge that match. If it's Monaco vs Fognini in round two, the Argetine has won three of four against the Italian and could find himself making a surprise run.
Fourth Quarter: David Ferrer (2)
Ferrer should have a chance to get rolling early as he starts wth wild card Nicolas Jarry. That likely sets him up in round two where he could see Albert Ramos-Vinolas or Dusan Lajovic. The Spaniard won a tough straight sets mach in Quito against Lajovic earlier this season. Both have played here before, so expect another competitive match. The Serb played better last week and might find some revenge in this spot.
In the other half of the quarter, 5th seed Dominic Thiem opens against Pablo Andujar. The Buenos Aires champ may be fighting fatigue this week and Andujar won't be an easy out. Wins for the Spaniard have been hard to come by, but his 4-2 mark in Rio says he could pull the upset if Thiem is gassed. The survivor gets Diego Schwartzman or Joao Souza. Schwartzman owns three wins against the Brazilian and has the confidence of an upset last week against higher ranked Alexandr Dolgopolov in clay in Argentina. Souza did seem to get a home boost last year here to make the quarterfinals, but his current form doesn't point to that happening again this year.