KEY BISCAYNE, Fla. (AP) _ Carlos Moya was on the verge of losing his No. 1 ranking to Pete Sampras after being beaten Monday by a Frenchman ranked 74th in the world.

Moya, playing his third three-set match in three days, lost 3-6, 6-4, 7-6 (11-9) to Sebastien Grosjean in the fourth round of the Lipton Championships.

Sampras was to play Albert Costa later Monday and needed a victory to reclaim No. 1. Moya became the first Spaniard to top the computer rankings when he overtook Sampras last week.

Against Grosjean, Moya's weariness showed late in the 2-hour, 40-minute match.

Both players had mishits and unforced errors during the tiebreaker before Grosjean slammed a running forehand winner for the victory.

Moya squandered three match points in the tiebreaker, hitting a forehand long, a forehand into the net and a backhand return long. Each player lost his serve three times in the final set.

Fourth-ranked Spaniard Alex Corretja, who also had a shot at No. 1 this week, lost to Thomas Enqvist 7-5, 6-3.

Francisco Clavet beat unseeded Vince Spadea 7-5, 4-6, 6-4, leaving Sampras as the only American in the men's draw. Seventh-seeded Richard Krajicek beat Marat Safin 6-3, 6-1.

In women's third-round play, Anna Kournikova downed Julie Halard-Decugis 6-4, 7-6 (7-5). Amanda Coetzer also won.