TO SERVE AND VOLLEY: Tennis ace Andre Agassi sees a volley of pitches every year from education entrepreneurs and passes on most of them. But here’s one that finally caught his eye: Square Panda, a Sunnyvale, CA-based creator of a phonics playset to help preschool children build literacy skills. It’s not the first education outreach for the Las Vegas native, whose foundation launched a local K-12 public charter school in 2001. Forbes contributor George Anders explores how Agassi’s decision to take a double-digit stake in the company may be related to his struggles in middle school.