MUNICH, DEC. 12 -- Ivan Lendl swept into the second round of the Grand Slam Cup and David Wheaton, Brad Gilbert and Aaron Krickstein also won today to put five Americans among the final eight.

Lendl, seeded second in the

$6 million event, beat Christian Bergstrom, 6-4, 6-0, and is the highest-seeded player remaining in the world's richest tennis tournament. Tuesday, top-seeded Stefan Edberg lost to Michael Chang.

Wheaton gained the only break of the match in the eighth game of the third set to outlast Yannick Noah, 7-6 (7-2), 6-7 (5-7), 6-3. Gilbert -- Andre Agassi's replacement -- rallied to beat Jonas Svensson, 2-6, 6-3, 6-4, and Krickstein beat Andres Gomez, the third seed, 6-3, 6-4.

The fifth American, U.S. Open champion Pete Sampras, won on Tuesday, as did Henri Leconte and Goran Ivanisevic.

The tournament comprises 16 players with the best records in the four Grand Slam events -- the Australian, French and U.S. opens and Wimbledon. Sweden's Bergstrom, ranked 80th, qualified by reaching the quarterfinals at Wimbledon, the third round of the French Open and the second round of the Australian.

He couldn't cope with Lendl, but leaves $100,000 wealthier. The champion here gets $2 million, first-round losers $100,000, quarterfinalists $300,000.

"I never think about the money during a match but when I was serving for the match at 5-3 in the third set, I literally started shaking," Wheaton said after surviving 22 aces by Noah. "I thought, 'Boy, that's $200,000 on the line.' But I worked right through it."

By making sure of getting at least $300,000, Wheaton nearly doubled his 1990 earnings and moved not too far from matching his accumulated career prize money, $481,712.