The Portland 10-and-under Junior Tennis Summer League begins June 28. This is a co-ed league. Players practice and play on smaller courts using modified balls. Ages 7-8 will meet on Fridays from 1:30 to 2:30 p.m. using 36-foot courts. Ages 9-10 will meet on Fridays from 3 to 4 p.m. using 60-foot courts. The season lasts for five weeks. Matches take place at the Cheverus courts. The cost is $65. Register online at Contact St. Peter’s Grand Slam Tennis at 207-831-8529.