Alcaraz, who beat Norrie on Sunday to win the Argentina Open, defeated Mateus Alves 6-4 in the first set and led 5-3 in the second when play was halted.

The second-ranked Alcaraz, the defending champion, struggled with his powerful forehand against Alves, ranked 556. The match lasted about 1 hour, 50 minutes before it was suspended. It is scheduled to resume Wednesday, and the winner will face either Fabio Fognini or Marcelo Tomas Barrios Vera in the next round.

Second-seeded and 13th-ranked Norrie beat Juan Manuel Cerundolo 7-5, 6-1. Norrie trailed 5-3 in the first set before rallying past Cerundolo, who is ranked 107.

The 27-year-old Norrie will face home crowd favorite Thiago Monteiro, who eliminated 2020 US Open champion Dominic Thiem on Monday.