LONDON, JULY 4 -- Ken Flach and Robert Seguso became the first doubles team in 60 years to come from two sets down to win the Wimbledon men's doubles championship.

Flach and Seguso, who went through a trial separation in their longtime partnership this spring, were re-united here. Today, they won their second Grand Slam title, beating Spain's Sergio Casal and Emilio Sanchez, 3-6, 6-7 (6-8), 7-6 (7-3), 6-1, 6-4.

For Seguso, it was the conclusion of a remarkable month of doubles. He had planned to play doubles this summer with John McEnroe. When McEnroe withdrew from doubles at the French Open after losing in the first round of the singles, Seguso picked up Anders Jarryd as a last-second partner. Together, they won -- coming from two sets down in the final against Yannick Noah and Guy Forget of France.

After the French, Seguso called Flach and suggested they join forces again at Wimbledon. Two years ago, after winning the U.S. Open, Flach and Seguso were the world's No. 1 doubles team. But they played poorly last year, leading to their decision to split for a while this spring. They will play in the Davis Cup competition together later this month when the United States faces West Germany in a match to determine which country will stay in the main draw for the 1988 Davis Cup. Flach and Seguso have not lost a Davis Cup doubles match in three years.

"I wasn't really happy when Robby wanted to split but it was probably a good thing," Flach said. "We just weren't playing well together for some reason. I was looking for a partner for Wimbledon when he called me and said he wasn't going to play with McEnroe."

Seguso has won three of the four Grand Slam events in doubles. He became the first man to win the French and Wimbledon in doubles in the same year since Bob Hewitt and Frew McMillan did it in 1972.

"I just told Kenny that something was wrong," he said. "We had won eight tournaments for two years and then we went a year without winning one. I think before the separation we would have bagged it {being} two sets down. Today, we hung in because we knew we were the better team."

They didn't break serve until the fourth set. Once they did, though, they took charge. "We really didn't play well at the beginning," Flach said. "Once we got the third set, though, we were okay. When we won the fourth, they started to panic."Men's Doubles Championship

Ken Flach, Sebring, Fla.-Robert Seguso, Sebring, Fla., def. Sergio Casal-Emilio Sanchez, Spain, 3-6, 6-7 (6-8), 7-6 (7-3), 6-1, 6-4. Women's Singles Championship

Martina Navratilova (1), Fort Worth, def. Steffi Graf (2), West Germany, 7-5, 6-3. Women's Doubles Championship

Claudia Kohde-Kilsch, West Germany-Helena Sukova, Czechoslovakia, def. Betsy Nagelsen, Kapalua Bay, Hawaii-Elizabeth Smylie, Australia, 7-5, 7-5. Mixed Doubles Quarterfinals

Darren Cahill-Nicole Provis, Australia, def. Sergio Casal, Spain-Raffaella Reggi, Italy, 6-4, 6-4. Mixed Doubles Semifinals

Jeremy Bates-Jo Durie, Britain, def. Danie Visser-Rosalyn Fairbank, South Africa, 7-6 (7-4), 6-3. Over 35 Men's Singles Championship

Tom Gullikson (1), Palm Coast, Fla., def. Bob Lutz, San Clemente, Calif., 6-3, 7-6 (7-3). Doubles Semifinals

Tim Gullikson, Boca Raton, Fla.-Tom Gullikson, Palm Coast, Fla., def. John Newcombe-Tony Roche, Australia, 7-6 (7-5), 7-6 (7-3). Ladies Plate Quarterfinals

Kathy Jordan (4), King of Prussia, Pa., def. Kim Steinmetz, St. Louis, 7-5, 6-4. Semifinals

Sara Gomer (5), Britain, def. Beverley Bowes (7), Lubbock, Tex., 6-3, 6-0; Kate Gompert (1), Rancho Mirage, Calif., def. Kathy Jordan (4), King of Prussia, Pa., 7-5, 6-3. TODAY'S FEATURED MATCHES Centre Court

Ivan Lendl (2), Czechoslovakia, vs. Pat Cash (11), Australia; Jeremy Bates-Jo Durie, Britain, vs. Andy Kohlberg, Dallas-Patty Fendick, Sacramento, Calif., or Darren Cahill-Nicole Provis, Australia. Court 1

Andy Kohlberg, Dallas-Patty Fendick, Sacramento, Calif., vs. Darren Cahill-Nicole Provis, Australia; Kate Gompert (1), Rancho Mirage, Calif., vs. Sara Gomer (5), Britain.