Marin Cilic and Fernando Verdasco moved into the Rio Open second round on a good day for the seeds on Monday.
Cilic, the top seed at the ATP 500 event played on clay in Brazil, cruised past qualifier Carlos Berlocq 6-3 6-2.
The Croatian, playing his first tournament since his runner-up finish at the Australian Open, did not drop serve, breaking three times to win in an hour and 19 minutes.
The eighth-seeded Verdasco was pushed but got past Leonardo Mayer 6-2 3-6 6-3 to make it four wins in as many meetings with the Argentinian.
Fabio Fognini, the 2015 runner-up and fifth seed, survived a huge scare, incredibly coming from a set and 4-0 down to edge Thomaz Bellucci 6-7 (5-7) 7-5 6-2, making it five wins in as many meetings with the Brazilian.
Albert Ramos-Vinolas, the fourth seed, also progressed after overcoming Rogerio Dutra Silva 6-3 3-6 6-4.
Meanwhile, Ecuador Open champion Roberto Carballes Baena retired in his first-round match when trailing Tennys Sandgren 4-6 6-1 4-3.
Runner-up in 2016, Guido Pella made an early exit, beaten by lucky loser Gastao Elias 6-4 5-7 7-5, while Nicolas Jarry beat Guillermo Garcia-Lopez 6-3 7-6 (7-3).
Latest on Sportstar
- Seven punished by Spanish government for racist insults against Vinicius
- French Open 2023: Rune beats Cerundolo in final set tiebreak, sets up quarterfinal rematch with Ruud
- Nacho, Fati called up to Spain squad for Nations League finals
- Asian U20 Athletics Championship: Shivam bags silver in javelin throw; Shakeel wins bronze in 800m
- Haddad Maia beats Sorribes Tormo in third-longest women’s match at French Open