Marcos helped make the draw for the Citi Open on Friday in Washington. Seeded 16th, he has a bye through the first round and will face either Lukas Lacko or Alejandro Falla in his opening match.
Marcos is in the bottom half of the draw and could face a third-round clash with second seed Kei Nishikori. Also in his quarter are eighth seed John Isner, No. 9 Alexandr Dolgopolov and Gael Monfils.
Juan Martin del Potro leads the field at this ATP World Tour 250 hard-court tournament, which also features Tommy Haas, Milos Raonic, Gilles Simon and Sam Querrey
