Pablo Cuevas carried momentum from his semi-final run at the Gonet Geneva Open to upset seventh seed Miomir Kecmanovic on Monday at the Belgrade Open.
Cuevas, currently ranked No. 91 in the FedEx ATP Rankings, dropped just five games in a 6-3, 6-2 victory over the Serbian. The Uruguayan will next face Argentine Federico Coria.
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Fifth seed Dusan Lajovic was the only Serbian to advance to the second round, following a 6-3, 6-3 win over Ricardas Berankis. Eighth-seeded Federico Delbonis survived a scare against lucky loser Lukas Klein but prevailed 3-6, 6-3, 6-4.
Elsewhere, Fernando Verdasco eased past Lucas Pouille 7-5, 6-2 and lucky loser Mats Moraing outlasted Egor Gerasimov 4-6, 7-6(7), 7-5. With the win, Moraing earned a chance to face top seed Novak Djokovic on Tuesday.