The new degree from Stanford is tucked away. The law books are on hold.

Patrick McEnroe, who will be 22 on Thursday, wants to try to do things his way. That means taking a shot at pro tennis and its big money for the son of a wealthy New York lawyer and kid brother of even richer, and noisier, John Jr.Young Patrick discovered quickly, though, there is no fairy godmother in the tough pro ranks.

He learned plenty while playing as an amateur the last couple of years. Patrick learned much more Monday night in his first official play-for-pay appearance.

Jimmy Arias, a teen-age sensation just a few years ago, trounced McEnroe 6-2, 6-1, in an opening round match Monday night in the $425,000 U.S. Pro Championships at Longwood.

McEnroe showed some fire typical of brother John on the court, but there was no shouting, no cursing.

The 61st annual week-long tournament on Longwood's sun-baked clay courts, worth $50,-575 to next Sunday's winner, got off to its usual slow start.

Defending champion Mats Wilander, seeded No. 1 in quest of a third title, second-seeded Andre Agassi and other high-ranked entrants drew a first round bye.

A few of the lower-seed players advanced with the exception of No. 10, Pedro Tebolledo of Chile, who was beaten 6-3, 6-4 by Mark Dickson of Tampa in a minor upset.

Among those advancing to the second round were ninth seeded Jaime Yzaga of Peru, No. 13 Lawson Duncan of Asheville, N.C., No. 15 Fernando Luna of Spain and No. 16 Todd Witsken of Carmel, Ind.

Unseeded Andrew Burrow breezed through the first round.