Fairy Tail Series 2 Episode 4: Gray vs. Rufus
Episode 4 of 102 of Fairy Tail Series 2, aired April 25, 2014, 25 minutes. Available with English subtitles and dub where released.
Episode summary
During the final event of the Grand Magic Games, Gray is tasked with beating Rufus, which is the key to Sabertooth's fall. But it seems to be a one-sided battle as Rufus uses his Memory Magic to make new magic, as well as causing Gray to forget his own!