With the remaining 36 originally scheduled to be played on Sunday, tournament officials instead decided to play just 18, as persistent rains continued to beat down on the area, forcing much slower-than-normal play.
With ten players within three strokes of the pace, Sunday should be a shootout.
Overnight leaders Lawrie and McGinley each shot 71 on Saturday, but Lee made the most significant move, as he birdied two of his final four holes at dusk to also join in the mix.
It was a bit difficult to sustain concentration towards the end, claimed Lee. To be honest, I didnt think we were going to be finished, so with the circumstances, I did well to birdie two of the last four holes.
The outright lead could have been Lawries alone, but the former British Open champion missed a four-foot birdie putt on No. 18.
I played fantastic, but the same as yesterday, I didnt putt very well, he said. The putt on the 18th was typical, after I hit a lovely pitch to four feet. Dribbled the putt and it caught the left edge and stayed out. It was a bad putting day again.
The day was also just marginal for McGinley, but he blamed some of the high scoring on the weather.
It was a lot tougher today and the rain made it horrible, McGinley said.
The Irishman may have the most to either lose or gain on Sunday, as he sits on the tenth spot in the Ryder Cup points list. And he knows what he has got to do.
Tomorrow will be an important days golf for me, but I dont want to put too much pressure on myself, the 34-year-old said. I just want to play with the same focus and determination as the last two days and play as hard as I can.
Click here for full-field scores from the Celtic Manor Resort Wales Open