BASEBALL Boston Red Sox Placed veteran OF Tony Armas on the 15-day disabled list because of a pulled thigh muscle; called up LaSchelle Tarver (International League-leading .359) from Class AAA Pawtucket. Cincinnati Reds -- Placed SS Dave Concepcion (.256) on the 21-day disabled list with a broken left hand; recalled SS Kurt Stillwell (.176 with Reds) from Class AAA Denver.

FOOTBALL Miami Dolphins -- Signed 11th-round draft pick TE Arnold Franklin of North Carolina and No. 12 pick RB Rickey Isom of N.C. State; reached tentative agreements with No. 7 pick LB Larry Kolic of Ohio State and veteran S Mike Koslowski. Tampa Bay Buccaneers -- Signed RB Ron Springs (reportedly to a two-year contract worth $350,000 per year) and OL Mark Drenth. New Orleans Saints -- Signed S Aaron Hill, CB Van Jakes, P Jerry Fife and T Sid Dodd. TENNIS U.S. Tennis Association -- Named Tim Mayotte to replace Jimmy Arias on the Davis Cup team that will compete in Mexico July 18-20. Arias was injured before the French Open and has not competed since. Mayotte, ranked 10th in the world, never has played in the Davis Cup. He will join Aaron Krickstein, Brad Gilbert, Ken Flach and Robert Seguso on the team under captain Tom Gorman. MISCELLANEOUS British Commonwealth Games -- Uganda became the third African nation to announce it will boycott the 49-nation games (in Edinburgh, July 24-Aug. 2) in protest against Britain's policy on South Africa. Nigeria and Ghana have said they plan to boycott. COLLEGES George Washington -- Named Ed McKee as director of sports marketing. McKee formerly managed the Washington office for Eagle Sports Group Ltd. and was the director of communications for the 1986 National Old Timers Baseball Classic. Florida -- Said high school basketball star Dwayne Davis does not meet the NCAA's academic requirements for freshman eligibility and will miss the 1986-87 season. Davis said he would pay his own way as a freshman so he would have four years of eligibility.