Sole-destroying: US tennis player’s shoe falls apart during Citi Open match (VIDEO)
The players were in the middle of the second set when the bizarre episode occurred, much to the amusement of the crowd at the stadium.
Rubin was 3-2 down when he scampered to the net to return a ball sent over by Isner. The 22-year-old player’s burst of speed apparently caused his shoe to shred.
World number 152 Rubin switched the destroyed footwear, which he later tossed into the crowd, converting the shoe into a tennis souvenir.
Rubin took a surprise 6-4 7-6 victory, ousting the higher-ranked Isner who was seeded second at the tournament.
He will next face Andrey Rublev of Russia for a place in the Citi Open quarter-finals