Unhappy 10th anniversary of the Senators' last ball game, fans . . . but you never know: June 15 was fifth anniversary of Joe Frazier's last fight, and here's the ex-champion preparing to take the comeback plunge at a New York press conference Friday -- most likely, announcing a Frazier-Scott LeDoux bout for mid-November, and we don't mean Smokin' Joe's heavyweight son Marvis.

Frazier, age 37 and at the moment 236 pounds, would risk it in Minneapolis, LeDoux's bailiwick, unless the Minnesota promoters can't get an arena date. In that event, it might be Atlantic City, and Frazier's opponent might even be a top-10 contender instead of the journeyman LeDoux.

But even network television executives wince. "I'm sure you'll see the second Frazier fight on TV," Frazier's lawyer told The Post's Dave Kindred. "But right now there is an understandable hesitation" to expose the first one . . .

Giants and Eagles grabbed yesterday for running-back help to assure keeping out of Redskin reach in NFC East. New York traded futures to Houston for Rob Carpenter; Philadelphia signed ex-Raider Booker Russell -- competition for ex-Terp/Packer Steve Atkins, an Eagle since a day earlier. Dumping Carpenter, starting fullback all season, Oiler Coach Ed Biles goes back to Bum Phillips' way: Earl Campbell rushing out of I-formation with Maryland man Tim Wilson as up back. Oops, a Giant hitch: Carpenter threatening to quit rather than report . . .

Nagoya and Seoul, rivals for the 1988 Summer Olympics, laid their cases before the IOC session in Baden-Baden, West Germany, yesterday and await the vote today. Nagoya officials cited Japan's "stable political situation"; Seoul could argue that a decision for South Korea would mean a first for developing countries . . . Canada's Calgary, Italy's Cortina d'Ampezzo and Sweden's Falun-Are got in last licks for the '88 Winter Olympics.

Jeff Lamp has finally agreed to Portland Trail Blazer terms, long-term, and they'll slot him at small forward . . . Bullets waived draftees Mike Ferrara of Colgate, Mike Howard and Eddie Brown and told free-agent forward Steve Sheppard, the ex-Terp getting a look-see, he won't be needed . . .

In Toronto, folks might conjure John Ralston as next head coach of the CFL Argonauts if they wanted to make something of the Argos having broken their 0-11 drought the first game after bringing him in as a defensive assistant. But bigger game was afoot in Toronto: a story that Dallas might be eyeing Frank Kush to succeed Tom Landry in 1982. Kush, Landry and Cowboy boss Tex Schramm all gave the report the horselaugh, though Schramm & Co. admit to thinking mighty kindly of Kush, who has the Hamilton Tiger-Cats winning their CFL division. Kush: "My chances of becoming coach at Dallas are as good as my becoming pope". . . .

Bum Phillips' cowboy hat: snatched off his head again, Sunday at San Francisco. "Poor security" in Candlestick Park, the Saintly coach lamented after the foul deed done as Phillips headed under the stands at halftime. Phillips assured the folks in New Orleans that the gesture they saw over the TV wasn't what it seemed -- he used his finger just to point out the fleeing culprit: "There he is. Yonder he goes." Phillips' hat was retrieved but so grungy he "just left it" and went to a visor cap . . .

A. Japan's 1981 home run king: Tony Solaita, Samoa to AL to 43 HR for playoff-bound Nippon Ham Fighters . . . Q. Three for price of one: Who managed Denver to 1981 American Association pennant? New president of Mexican League? First team to sign a Korean for its major league roster?