Pedro Martinez is going to be out far longer than this postseason: The New York Mets' ace will miss the start of 2007, too — because of an injured pitching shoulder.

Already ruled out of the playoffs because of a bad left leg, the three-time Cy Young Award winner now will have right rotator cuff surgery next week and won't resume throwing off a mound until June, Mets general manager Omar Minaya said yesterday.

Martinez (9-8) lasted only 2 2/3 innings at Atlanta on Wednesday as he tried to recover from an injury to his right calf muscle. Exams Thursday revealed a problem with his other calf — which was announced — and also uncovered the trouble in his rotator cuff — which wasn't.

MANAGERS

ROBINSON, ALOU OUT; BAKER AWAITS NEWS

Frank Robinson will not return as the Washington Nationals' manager in 2007, the team announced yesterday.

The 71-year-old Robinson has managed the Expos-Nationals franchise for the past five seasons. The regular season ends today, and at 71-89, Washington was assured of finishing last in the NL East for the third consecutive year.

In other news, Felipe Alou all but confirmed yesterday he will not return to manage the San Francisco Giants (76-84) for a fifth season in 2007. The 71-year-old Alou's contract expires after the season.

Meanwhile, Chicago Cubs manager Dusty Baker will find out tomorrow morning whether the organization wants him back, Chicago general manager Jim Hendry said yesterday. Baker's four-year contract is expiring with the Cubs (65-96).

DRUG PROBE

GRIMSLEY IMPLICATES OTHERS IN AFFIDAVIT

Roger Clemens, Andy Pettitte and Miguel Tejada were among the players that a former major league pitcher accused of using performance-enhancing drugs, according to a federal agent's affidavit, the Los Angeles Times Web site reported yesterday.

The agent for Clemens and Pettitte denied the accusations. Baltimore teammates Brian Roberts, Jay Gibbons and Tejada also were implicated in the sworn statement, the Times said; an Orioles spokeswoman said the team had not seen the report and had no comment.

In June, federal agents searched reliever Jason Grimsley's Arizona home after the pitcher admitted using human growth hormone, steroids and amphetamines. Grimsley was released by the Arizona Diamondbacks and suspended 50 games by Major League Baseball, and has not played since then.