Germany's Philipp Kohlschreiber has pulled out of the Barcelona Open due to a lower back injury. The German last played at the Monte Carlo Masters -- where he was defeated by Bulgarian Grigor Dimitrov in the last-16. Kohlschreiber has played in Barcelona seven times so far in his career.

The German twice made the semi-finals in Barcelona -- in 2013 and 2016. Russian Alexey Vatutin will replace Kohlschreiber as a lucky loser in the Barcelona main draw. The 25-year-old was defeated in the Barcelona qualifying round by France's Corentit Moutet.

The Russian is due to make his Barcelona main draw debut. Vatutin has been drawn to meet qualifier Bjorn Fratangelo in round one. World No. 138 Vatutin recently made it past the Marrakech qualifying to make his debut appearance at the Morrocan ATP 250 clay-court tournament.

The 25-year-old won two qualifying and two main draw matches before he was defeated in the Marrakech quarter-finals by eventual champion Pablo Andujar. Also read: Ronnie O'Sullivan praises Roger Federer's all-time Grand Slam title record