Second-seeded Jimmy Connors joined No. 4 Pat Cash and No. 5 Yannick Noah in the quarterfinals of the $490,000 Stella Artois Italian Indoor Championships in Milan with a 6-3, 6-1 victory over West German Eric Jelen.

Cash of Australia, playing with a new Japanese racket, held off Spain's Sergio Casal, 6-3, 6-7 (7-5); Noah defeated Alex Antonitsch of Austria, 6-4, 1-6, 6-3.

Connors, 35, had to fight to maintain a 4-1 first-set lead, but after taking the opener, bore down to put away the match in just over an hour . . .

Unseeded Hu Na, who defected from China five years ago to play pro tennis in America, upset eighth-seeded Catarina Lindqvist, 6-2, 6-2, to gain the quarterfinals of the $250,000 Virginia Slims of California in Oakland.

Top-seeded Martina Navratilova needed only 41 minutes to gain a 6-2, 6-0 victory over Wendy Turnbull, who injured her eye earlier in the day . . .

In Memphis, Jim Grabb, ranked No. 62 in the world, stunned top-seeded Stefan Edberg of Sweden, 6-4, 6-4, to advance to the quarterfinals of the $415,000 U.S. Indoor championships.

Grabb, of Tucson, defeated Edberg, the defending champion, in 91 minutes with outstanding serve-and-volley play.

Third-seeded David Pate beat Jim Pugh, 4-6, 6-3, 6-3.