Fairy Tail Episode 173: Battle of Dragon Slayers!
Episode 173 of 175 of Fairy Tail, aired March 15, 2013, 25 minutes. Available with English subtitles and dub where released.
Episode summary
The fourth day of the X791 Grand Magic Games continue with the second match of the day, Lamia Scale against Mermaid Heel. Both sides struggle to win, only to end the battle in a draw, leading to the beginning of the last match between Fairy Tail's and Sabertooth's Dragon Slayers.