The 645th episode of the One Piece anime, scheduled for May 18, will be titled,

「破壊砲炸裂！ルーシー危機一髪」

The Destructive Cannon Explodes! A Close Call for Lucy

A new blurb for One Piece 644 has also been unveiled.

“The Battle in Block C continues with the Giant Warrior Hajrudin crushing all his opponents with great force, while gathering the attention along the way. Meanwhile, Luffy is riding the fierce bull Brutal Bull, while rampaging on the battle ground.“

Special thanks to Chaozek for the translation.