There are at least four artists sharing this name.
1. Tennis is Patrick Riley and Alaina Moore, a husband/wife duo. The idea for the project began one day a couple of years ago when Alaina made fun of Patrick for playing tennis in college. A year later the two fled their hometown Denver to spend eight months sailing and exploring the North Atlantic coast. During their adventures they began writing music together documenting their experiences. The Longboat Pass Songfacts reports that the pair eventually recorded their songs. Read more on Last.fm