Masters champion Larry Mize, considered by many a favorite to win this week, eagled the sixth hole for the second straight day and shot 6-under-par 65 to win the 18-hole division of the rain-interrupted Kemper Open Pro-Am yesterday.

Because of a two-hour delay caused by a thunderstorm, pros and their teams teeing off in the afternoon were limited to nine holes.

Dave Barr and Joey Sindelar were the low pros in the afternoon on the front nine with 34 (par 36). Mike Reid shot 31 and won the back-nine (par 35) pro prize.

Due to the havoc created by the rain, PGA Tour officials said a money breakdown for the pro-am would not be available until today.

A man with right to curse the emptying heavens was 1985 Kemper champion Bill Glasson, whose 328-yard drive on the second hole likely would have held up for the $5,000 first prize in the MCI long distance driving competition. Since all pros did not play the hole, the competition was wiped out.

The longest amateur drive on the hole was Stan Brock's 301-yarder, followed by Gary Minter (287) and John Axel (281). They received trophies.

Mize hit a 6-iron second shot three feet from the hole and scored eagle 3 on the sixth hole. He eagled the same hole in winning the Merrill Lynch shootout on Tuesday.

Pro Howard Twitty teamed with Bill Hefner, John Malhame, Bill Glavin and Winthrop H. Smith to win the 18-hole team prize.

Three front-nine team winners tied at 28: defending Kemper champion Greg Norman, Ron Salvitti, Harry Marren, Jack Colbert and Dennis Broderick; Lanny Wadkins, Stan Brock, Kent Feddeman, Don Bitz and Rudi Landolt; and Gil Morgan, Roger Haynes, Dick Blum, C. Willis Ritter and Jack Butler.

Tied at 27 to share low back-nine team were: Reid, Ed Burke, Arthur Parsons, Ralph Deater and Maurice Rhinehart; and Bob Gilder, Willard Hyde, Milt Drewer, Ron Townsend and Don Reed. . . .

Ron Streck withdrew from the Kemper and was replaced by Dennis Trixler.