John Lloyd upset fourth-seeded Pat Cash of Australia, 6-2, 6-3, Wednesday in the second round of the $200,000 River Oaks Tournament in hot and humid weather at Houston.
Eighth-seeded Brad Gilbert became the second upset victim of the tournament, losing to Ramesh Krishnan of India, 6-3, 4-6, 6-4.
In other matches, third-seeded Kevin Curren of South Africa beat back a challenge by Sandy Mayer, 7-6, 6-4, and unseeded Paul McNamee of Australia surprised fourth-seeded Joakim Nystrom of Sweden, 6-1, 6-4.
"It was like an oven out there," Lloyd said. "I think conditioning will decide a lot of matches this week. But I think this match was too short to be conditioning. He just had trouble adjusting to the clay courts."
Lloyd, ranked 47th in the world, broke Cash, ranked ninth, in the first game of the match with a backhand volley winner and again in the seventh game on Cash's forehand net error while coasting through the first set.