Ruben (ATP-249) has won his first match at the Challenger tournament of Koblenz (Germany, CH 80). In the doubles he advanced to the quarterfinals.
Ruben, seeded twelfth in Koblenz, had a bye in the first round. In the second round he easily defeated the Russian Artem Dubrivny (ATP-403) with 6-3 and 6-1. Seventh seed Quentin Halys (ATP-193) will be his next opponent in the third round.
In the doubles, Ruben (ATP D-183) and Daniel Masur (ATP D-180) were too strong for Ivan Sabanov (ATP D-153) and Matej Sabanov (ATP D-153), they won the encounter with 6-4, 3-6 and 10-6. In the quarterfinals they face second seeds Antonio Sancic (ATP D-121) and Tristan-Samuel Weissborn (ATP D-96).