With home hero and former champion Grigor Dimitrov opting to play in San Diego, Jannik Sinner and Gael Monfils will assume the marquee at the ATP event in Sofia, Bulgaria.
Sinner could meet Vasek Pospisil in his opener in a rematch their title match a year ago won by the Italian for his first crown..
The 20-year-old Sinner is joined by No. 2 seed Monfils, Alex De Minaur, Alexander Bublik, Lorenzo Musetti, Alejandro Davidovich Fokina, Benoit Paire and Emil Ruusuvuori.
Monfils will open against the winner between Ilya Ivashka and Pablo Andujar. Bublik could meet Musetti in the second round.
In its sixth year, the event has also been won by Daniil Medvedev and Roberto Bautista Agut.
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