Gulbis! Istomin vs Tsitsipas is the match i want to watch the most with JLR vs Montañes. Hope Rublev gets into the main card also.
Montanes does not have much of a chance there IMO, Istomin should win too.
Gulbis making his return will be fun, Stak's form's not so good right now, so a win is possible.
Other close matches on paper will be Herbert-Bemelmans, Youzhny-Donskoy and Copil-Kamke.