Steve Johnson vs Reilly Opelka prediction

over 21.5 games looks the value bet at 8/11, Reilly Opelka is ranked at 39, he has shown form this year winning the ATP event at Delray Beach as well as beaten in the Q/Final at the ATP event in New York, he has a good service record winning 80% first service points although his return service record is a little weak, winning 21% of first service return points, Steve Johnson is ranked at 63, he has shown form this year, won Challenger events at Indian Wells and Bendigo as well as reaching the Q/Final of the ATP event at Delray Beach, he has a decent service record, 75% first service points won and 26% first service return points won, close match on paper with at least 1 tie break expected