PGA Tour professionals invade the Washington area on two fronts today, some in the pressurized "rabbit" qualifying for the Kemper Open at Congressional and others in the Fellowship of Christian Athletes National pro-am at Country Club of Fairfax.

About 63 nonexempt PGA Tour players tee off this morning at 8 vying for 15-18 spots in the Kemper field. The Kemper starts Thursday at Congressional, on River Road in Maryland.

Arnold Palmer yesterday entered the Kemper, which will begin with 156 players. The final spots in the field will be filled out by today's qualifiers.

In the FCA benefit at Fairfax, Larry Nelson, the second-leading money winner on the PGA Tour last year, heads a list of 26 touring pros including Craig Stadler, winner of two Tour events this year. PGA Commissioner Deane Beman and Washington Redskin quarterback Joe Theismann also will play.

Jeff Mitchell, Doug Tewell and Mark Pfeil are other winners on the 1980 Tour set to challenge Dave Eger, who won the inaugural Fairfax event last year. Stadler tees off on the 10th tee at 9:30. Nelson starts on hole No. 1 at 12:50.

Andy Bean, Curtis Strange and Lee Elder withdrew from the FCA event for various reasons, but Joe Inman, Miller Barber and Lyn Lott have been added to the field.