This week Ruben (ATP-249) will be in action at the Challenger tournament of Koblenz (Germany, CH 80). He is the twelfth seed.
As a seed, Ruben is has a bye in the first round. In the second round he has to face the Frenchman Dan Added (ATP-373) or the Russian Artem Dubrivny (ATP-403).
Ruben (ATP D-183) also plays doubles this week together with Daniel Masur (ATP D-180). In the first round they have to face Ivan Sabanov (ATP D-153) and Matej Sabanov (ATP D-153). Last week Ruben and Dustin Brown (ATP D-347) were too strong for the Croatian duo in Cherbourg.