Reggie Jackson became Mr. December today, talking his baseball future with . . . the Yankees. He led off a week of shopping by sounding out Brave and Angel representatives yesterday. On deck: Orioles and one unnamed team . . .

Have the Colts edged closer to tapping Art Schlichter or Jim McMahon with their expected NFL No. 1 pick? Coach Mike McCormack -- maybe he'll be around for the draft -- gives further evidence of losing patience with Bert Jones.

Jones, five-time sackee in Sunday's 25-0 skunking by the Jets, chewed out his linemen in public; was seen jawing at McCormack, and as for the way Jones ran out the clock on consecutive loss No. 12, the coach said, "I didn't like that. I asked him if his shoulder was hurting."

Jones: "I lost my head."

McCormack: "Maybe David Humm will start this week."

Between a 4-6-1 year and all those Carolina writers voting, Maryland has gone zero for 1981 in all-ACC football. The 24-member squad is loaded with eight Clemson Tigers, seven UNC Tar Heels; N.C. State has four, Duke three, Virginia one (DL Stuart Anderson) and Wake Forest one (TE Phil Denfeld, the former Annandale all-Met) . . . ECAC major college all-star team is loaded with Navy's Eddie Meyers, Steve Fehr, Keith Boring, Jeff Shoemake, Tim Jordan and Army punter Joe Sartiano, soph from Falls Church's Marshall High.

Newest new wave advances in women's tennis: Kathy Horvath, 16, beating Kathy Rinaldi, 14, in all-American final at the South African Open, 7-6, 6-4 . . . Bonnie Gadusek, 18, a Pittsburgh native who took up the game after narrowly escaping paralysis when she dislocated neck vertebrae in a gymnastics spill at 13, a 6-3, 6-1 winner over Dianne Fromholtz in the opening of the Australian Women's Open; Californian Lea Antonoplis a 6-3, 6-4 upsetter there of Virginia Ruzici . . .

Utah's five-year football coach, Wayne Howard, has quit after an 8-2-1 season -- "the best kind of year to leave on." He's talked to UNLV, prefers to apply at California, which eyes San Jose State's Jack Elway.

NBA Cleveland owner Ted Stepien has told Don Delaney he'll be slid from coaching to front office in the next few days, "assuming I can get one of the three guys I have targeted." Prime target: Hubie Brown . . .

Didn't believe ex-champ Muhammad Ali serious about fighting Trevor Berbick? D.C. Armory has news for you: Closed circuit Dec. 11, from Nassau, of Ali-Berbick, Hearns-Geraldo, etc., plus live bouts . . .

A. Oldest living ex-major leaguer, as of November check for us by Society for American Baseball Research: John Gilligan, 96 (born Oct. 18, 1885), of Modesto, Calif.; 12 pitching appearances with St. Louis Browns 1909-10. Longevity leader among 10-year vets: right-hander Ray Fisher, Yankees/Reds 1910-20, later longtime U. of Michigan baseball coach (b. Oct. 4, 1887) . . . Q. Tailback matchup last time Buffalo beat the Redskins (1972)?