Says C. Raymond Grebey, director of the (owners') Players Relations Committee, who acted as counsel for the ball club: "On behalf of the Braves, this is a major victory. The basic issue was whether or not Horner could jump the Braves and sell himself to a contending club and he lost that fight."

Says Marvin Miller, players association director who represented Horner: "We won . . . a floor on Horner's 1980 contract and he ends up this year a probably the highest-paid player in history in point of service" . . .

Maybe Horner is lucky he didn't become a free agent, he got hurt abd enough opening day when he injured an ankle and missed a month of 1979 not to court fresh disaster. Look at all the big-money free agents getting a lot of that big money currently or recently sitting out hurt: Gossage, Jackson, Hisle, Forster, Hunter, Garland, Messersmith - and now again, Andy Messersmith, who went on the disabled list yesterday with a mate on the Dodger starting staff, Doug Rau.

Messersmith on 21-day idle status, pain in right arm and neck: southpaw Rau worse - lost for the year, torn rotator cuff in his pitching shoulder.Tom Lasorda's guys in blue are in big trouble. . . .