Lenny Dykstra to Judge -- My Son is a Baseball STUD, Let Me Watch Him Play

Lenny Dysktra's youngest kid is a high school baseball superstar -- one of the top prep prospects in CA -- and TMZ has learned Lenny is begging a judge to let him watch his son in action.

Lenny is currently on house arrest stemming from his embezzlement case -- but the disgraced MLB star has filed new court documents in California asking the judge for permission to leave the house to watch his son, Luke Dykstra dominate in a Wednesday night baseball league.

Luke -- a high school sophomore -- had a stellar freshman season, batting .383 with 29 runs, 15 RBIs, 10 doubles -- plus he was named to the MaxPreps.com Freshman All-American team.

In court documents, Lenny claims the court had previously ruled that he was cool to "[attend] his son's sporting events. provided he notifies [the court] in advance" ... so he should get the OK.