Marge Everett, Hollywood Park's chairman and chief operating officer, said Sunday she remains "mystified" at the poor condition of the track's grass course. A combination of treatment error and uncooperative weather has left the course bare and brown in spots despite the application of chemicals, fertilization, hydro-seeding and the like. "It's weird," Everett said. "I almost collapsed when I saw what was going on. This is a total embarrassment to me. I bet we've spent $100,000 between the end of the last meeting and now trying to do the right thing (to prepare the course). This was really just bad luck. I don't think in any way it was neglect on our part. It was just unfortunate circumstance." . . . Jockey Laffit Pincay increased his lead in the standings with a hat trick on Sunday. Pincay brought his win total for the meeting to 30 by taking the third, fourth and seventh races. . . . The $200,000-added Grade II Mervyn LeRoy Handicap, the feature race on today's Memorial Day card at Hollywood Park, has attracted a field of seven, headed by Judge Angelucci, who is undefeated in three starts this year. Winner of the San Bernardino Handicap at Santa Anita his last time out, Judge Angelucci and jockey Bill Shoemaker have drawn the No. 5 post for the mile race on the main track. The competitive field also includes the Laz Barrera-trained Launch A Pegasus, winner of February's Grade I Widener Handicap; Sabona and Zabaleta, both trained by John Gosden; Fred W. Hooper's Metronomic; millionaire Nostalgia's Star, and Grecian Wonder. . . . Rivlia, trained by Charlie Whittingham and ridden by Chris McCarron, scored a neck victory over Air Display Sunday in the 41st running of the $300,000 Golden Gate Handicap at Golden Gate Fields. Rivlia, carrying 116 pounds, covered the 1 3/8 miles in 2:14 1/5 and paid $8.00, $4.40 and $3.20. Air Display returned $5.80 and $4.40. Reco, who finished another six lengths back, paid $3.20 to show. It was the second Golden Gate Handicap victory for McCarron, who won aboard John Henry in 1984.