Homerun Battle 3D seems to get everything right for the iPhone multiplayer game. There's a fun game that can be played in quick bursts or for long periods of time. A great reward / collection system, customization, and depth. All of that in a home run derby game that keeps players coming back.

Developer: Com2uS Corp.
Original Release Date: 1251133200
Category: 6014
Currently $0.99 in the iTunes app store.

2009 Best Sports Game Second Place

Backbreaker Football by NaturalMotion


Original Release Date: 1258498800
Category: 6014
Currently $0.99 in the iTunes app store.

2009 Best Sports Game Third Place

Touchgrind by Illusion Labs


Original Release Date: 1234126350
Category: 6014
Currently $4.99 in the iTunes app store.

2009 Best Sports Game Honorable Mentions

Developer:
Original Release Date:
Not currently available in the iTunes app store.

FIFA 10 by EA SPORTS™

Developer: Electronic Arts
Original Release Date: 1255403400
Not currently available in the iTunes app store.

X2 Soccer 2009

Developer: Exient IP Limited
Original Release Date: 1257985971
Currently $4.99 in the iTunes app store.

Super KO Boxing 2

Developer: Glu Games Inc
Original Release Date: 1258718042
Currently $0.99 in the iTunes app store.

Developer:
Original Release Date:
Not currently available in the iTunes app store.

Baseball Superstars® 2010

Developer: GAMEVIL USA, Inc.
Original Release Date: 1259449800
Not currently available in the iTunes app store.

Real Soccer 2010

Developer: Gameloft
Original Release Date: 1254092400
Not currently available in the iTunes app store.