The Rock Coast Rollers will jump into the 2014 season with The Nautical Knockdown, a doubleheader featuring RCR’s The Perfect Storm against Casco Bay Gentlemen's Derby — a battle of the sexes — and RCR’s Breakwater Blackhearts against the Bay State Brawlers.

The event is Saturday, May 31 at 6 p.m. at the Midcoast Recreation Center. The doors open at 5 p.m.

The cost is $10 in advance and $12 at the door.

The halftime performance will be Droplet Dance.

Tickets are available online at brownpapertickets.com/event/660532 or at the following local vendors: Good Tern Co-op, Belfast Co-op, Clean Bee, Midcoast Recreation Center, Fog Bar and Megunticook Market.

A portion of the proceeds from the bout will go to the Darling Marine Center, UMaine.

The after party will be at the Trackside Station in Rockland.