Sixth seed Frances Tiafoe and fellow American Taylor Fritz booked their places in the second round of the Libema Open with two-set wins on Monday.
Tiafoe went into his match against Joao Sousa following back-to-back losses on the ATP Tour, but he returned to winning ways with a 6-2, 7-6 (7-0) victory in one hour and 15 minutes.
The American broke twice in the first set and after trading breaks with the Portuguese in the second, he ran away with things in the tie-breaker.
Up next is Jordan Thompson after the Australian beat Tommy Paul from the United States 3-6, 6-1, 6-4.
World No 41 Fritz earned himself a second-round encounter against second-seeded Borna Coric as he beat wildcard Jurij Rodionov 7-6 (7-2), 6-4.
Seventh seed Cristian Garin made light work of qualifier Salvator Caruso, winning 6-1, 6-4 to set up a clash against Robin Haase, who was a 5-7, 7-6 (7-2), 7-6 (7-4) winner over Ugo Humbert.
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