Ruben (ATP-170) will be in action this week at the challenger tournament in Portoroz, Slovenia. He starts the tournament as the eight seed.
In the first round Ruben will face Czech Jan Mertl (ATP 268). The 34-year-old Mertl won their three previous encounters.
Together with Spaniard Adrian Menendez-Maceiras (WTA D-235) Ruben (ATP D-225) is seeded second in the doubles. In the first round they play against Yannick Mertens (ATP D-560) and Frenchman David Guez (ATP D-282).