A casting call for episode 9 of Cougar Town, "Here Comes My Girl" gives us a glimpse into what's to come:
[LISA] 13 - 15 years old to play 13, a bit of a tomboy. Lisa and her friends are playing basketball against Andy (Ian Gomez), Bobby (Brian Van Holt) and Grayson (Josh Hopkins) and are totally schooling them. 2 scenes, 3 lines, Co-Star.
More details given in casting sides: