Robert Wrenn and Gary Hallberg, who were teammates at Wake Forest, moved into a first-place tie yesterday after three rounds of the rain-delayed $600,000 Greater Milwaukee Open PGA tournament in Franklin, Wis.

Wrenn shot 70 and Hallberg 67 for their 13-under-par total of 203 over the 7,030-yard, par-72 Tuckaway Country Club course.

Second-round leader Larry Ziegler shot an even-par 72 and was tied for the runner-up spot at 204 with Wayne Levi, who shot 68. Fred Couples, at 65, was next at 205, followed by Nick Price, Dan Pohl, Bill Kratzert and Mark Calcavecchia at 206.

The tournament, which was delayed by a rainstorm Thursday, was hit by more rain yesterday afternoon, but, although play was delayed for a time, no postponement was necessary . . .

Cindy Hill shot a 5-under-par 67 and Missie Berteotti 70 to share the lead at 208 after three rounds of the $225,000 LPGA Safeco Classic in Kent, Wash. One stroke back was Jan Stephenson, who shared the second-round lead with Berteotti, but fell back with a 71. Nancy Lopez had the best round of the tournament, a 66, to move into a tie for fourth at 211 with Kathy Postlewait . . .

Left-hander Bob Charles, a runner-up in each of his last two tournaments, shot a 6-under-par 66 for a two-shot lead after two rounds of the PGA Senior Tour's $325,000 Crestar Classic in Richmond. Charles had a 36-hole score of 10-under 134. Defending champion Chi Chi Rodriguez, Dale Douglass and Larry Mowry were next at 136 . . .

Woody FitzHugh of Woody's Range shot a 2-under-par 70 to take a three-shot lead after the first round of the 36-hole Henson pro-am tournament at Green Hill Yacht and Country Club in Quantico, Md.

Buddy Sass of nearby Ocean Pines, Alex Lively of Leisure World and John NcNaney of Hobbit's Glen in Columbia were tied for second at 73.