BARCELONA, Spain -- Robert Kubica was unable to properly enjoy his return to an official Formula One session due to the poor balance of his Williams car on Friday.
Williams' reserve driver replaced Sergey Sirotkin for the opening practice of the Spanish Grand Prix weekend. The Polish driver has completed a handful of test appearances since his return to the cockpit for Renault last year at the post-Hungarian GP tests, but this was his first participation in a grand prix weekend since the 2011 rallying accident which prematurely ended one of the championship's most promising careers.
Friday's two sessions featured an unusually high amount of driver errors on the newly-relayed Circuit de Catalunya circuit, but Kubica also struggled to get on top of his car in the 90-minute window.