A long weather delay caused the first round to be suspended by darkness with 23 players still on the North Shore Country Club course.
Langer had completed his opening round with a 5-under 67, the same score turned in by Craig Stadler and Duffy Waldorf.
Sandy Lyle, Blaine McCallister, David Frost, Jeff Hart, Jeff Sluman, Gary Hallberg and Scott Hoch all shot a 4-under 68. Peter Senior was also at 4-under with two holes to play and Mark Calcavecchia was at 4-under with four holes to go.
Langer is second in the season-long points race, having won this year at the ACE Group Classic and the Greater Gwinnett Championship.
Waldorf has yet to win in his first full year on the Champions Tour but has finished among the first six on five occasions.