Rubin won 6-4, 7-6 (5) over Lucas Pouille in the second round of the Indian Wells challenger on Tuesday.
Rubin, ranked No. 250, pulled off the big upset of a player ranked nearly 200 spots ahead of him to reach the third round of this hefty challenger event. The 24-year-old American got as high as No. 125 in the world in 2018, but has since fallen off. He's 1-1 at tour-level in 2020.