Defending champion David Ferrer kicked off his Swedish Open campaign with a win while fellow Spaniard Fernando Verdasco also advanced.
Ferrer, who is looking for his fourth title in Bastad, secured a 6-2, 7-5 victory over Zdenek Kolar, who was making his ATP Tour debut.
Verdasco took two hours and nine minutes to see off Lorenzo Sonego 6-4, 3-6, 6-1 and set up a second-round encounter against Pedro Sousa, who beat Radu Albot 6-4, 6-3.
Italian Simone Bolelli earned himself a clash against top seed Diego Schwartzman after he came from a set down to beat Roberto Carballes 4-6, 6-3, 6-4.
Federico Delbonis won an all-Argentine tie as he beat his compatriot Horacio Zeballos 6-7 (2-7), 6-2, 6-2. He will take on John Millman next after the Australian steamrolled Guido Andreozzi 6-0, 6-2.
Meanwhile, Denis Istomin set up a clash against third seed Fabio Fognini with a solid 6-3, 6-3 victory over Swedish wild card Mikael Ymer.
High praise for Coco Gauff from the great Martina Navratilova.
Good news from the Novak Djokovic camp.
John McEnroe not so sure Rafael Nadal will play US Open.
Daniil Medvedev on his two different personalities.
Australian icon sort of, kind of supports Nick Kyrgios.
Kevin Palmer highlights a Serena Williams memory.
Milos Raonic on the Adria Tour debacle.
Mouratoglou raises questions about hosting US Open.
Plenty of positives for Andy Murray.
Kevin Palmer on Roger Federer’s SW19 breakthrough.