Ivan Lendl broke Stefan Edberg's serve three times in a second-set tie breaker yesterday to win the $375,000 Player's International in Montreal, 6-4, 7-6 (7-2).

For his fourth Player's title dating to 1980, Lendl won $51,000. Edberg, who lost to Boris Becker in the 1986 final, earned $25,500.

Lendl said he considered defaulting during the match because he was ill. He said he had been eating and sleeping irregularly.

"I've been feeling sick to my stomach during the last few days," he said. ". . . I couldn't have played a third set."

He said he went to a doctor to complain about tiredness and plans to rest a few days to soothe his stomach before resuming practice for the U.S. Open, which will start Sept. 1.

"I've played 19 singles matches in the last 24 days," he said. "It's too much. I need a couple of days off to take it easy."

He has won 27 of 28 matches since the start of the French Open, losing only to Pat Cash in the Wimbledon final.

In the semifinals played earlier yesterday because of rain Saturday, Edberg beat defending champion Becker, 6-2, 6-4, and Lendl defeated Jimmy Connors, 7-5, 6-4.

In addition to his two matches in a day, Edberg played two doubles matches Saturday night. Lendl did not play Saturday.

In their semifinal, Edberg committed 10 unforced errors to 19 by Becker, who had four double faults to Edberg's one. Edberg had lost eight straight matches to Becker.

"I was still in bed," Becker said when asked whether a late doubles match Saturday night affected his play yesterday. "It was ridiculous. I didn't know where I was. That was it. They {tournament organizers} didn't give me a chance to defend my title." . . .