Ilya Ivashka earned a meeting with Stefanos Tsitsipas at the Mallorca Championships, while Alex de Minaur got his Eastbourne International defence up and running with a straight-sets win on Monday.
A comfortable 6-4 6-1 victory over Emil Ruusuvuori sent Ivashka into the second round, where world number six Tsitsipas awaits after receiving a bye.
Mallorca third seed Denis Shapovalov will face Benjamin Bonzi who benefited as Alejandro Tabilo retired while trailing 6-3 4-2 to the Frenchman.
Roberto Bautista Agut overcame Taro Daniel 6-4 7-6 (7-4) to advance, while Antoine Bellier defeated Federico Delbonis 6-3 7-6 (8-6) and Feliciano Lopez fell to a 7-6 (7-3) 7-6 (7-3) loss to Tallon Griekspoor.
De Minaur took an hour and 23 minutes to get past Cristian Garin 6-3 6-3 for a strong start in his bid to retain the trophy in Eastbourne.
Kicking things off
— ATP Tour (@atptour) June 20, 2022
De Minaur defeats Garin 6-3 6-3 @alexdeminaur | @the_LTA | #RothesayInternational pic.twitter.com/qNCwpJ0oBU
The Australian will either face compatriot James Duckworth or Lorenzo Sonego, who he defeated in the final last year, in round two.
Fifth seed Reilly Opelka fell to a 6-3 6-1 defeat against tournament debutant Maxime Cressy, while Alexander Bublik was three points away from losing to Frances Tiafoe before rallying back to win 5-7 7-6 (7-4) 6-0.
Bublik will face John Millman next after the Australian overcame Sebastian Korda 6-3 7-6 (7-5), while top seed Cameron Norrie awaits Brandon Nakashima and Diego Schwartzman is next in line for Jack Draper.
Korda withdrew from Wimbledon after the defeat to Millman, the 21-year-old American saying on Twitter he was suffering with "terrible shin splints and beaten up feet" and needed a rest.