Ruben (ATP-114) was not able to reach the main draw of the Rakuten Japan Open Tennis in Tokyo. He narrowly lost his match in the first qualifying round.
Ruben had to compete against sixth seed Bradley Klahn (ATP-95) in the first qualifying round. The Belgian won the first set with 6-2, but Klahn took the second set 3-6. The third set was decided in the tiebreak, which went 6-7 (4) to the American. The match lasted 1 hour and 57 minutes.