Coming off a second-place finish Sunday in the British Open, Kuchar shot a 4-under 68 to reach 5 under - leaving him seven strokes behind second-round leader Martin Flores at Glen Abbey.
On Thursday, Kuchar had a couple of dizzy spell and sought medical attention during the round. He has an endorsement deal with tournament sponsor RBC.
Flores shot his second straight 6-under 66 on the rain-softened course.
''The course is perfect,'' said Flores, winless on the PGA Tour. ''But it is a little soft right now, especially coming into the greens as compared to previous years. So the birdies are going to be out there for sure. Unless the wind picks up, but I think it's very gettable.''
He eagled the par-5 second for the second day in a row.
''I hit a great drive,'' Flores said. ''I had about 185 yards. Hit a nice 7-iron to 15, 20 feet and made the putt. That was a bonus.''
''I just had everything clicking today,'' Woodland said. ''I've been playing well for a long time and just haven't put all the aspects together. Today I drove it well. Obviously, the ball-striking was good and I saw some putts go in, and that adds up to a pretty good number.''
''If I turn up at a golf tournament and know that I can't win, I might as well go home,'' Singh said. ''I just have to work hard and bring it to the golf course. Otherwise, might as well not show up. So that's what I'm doing.''
Singh won the 2004 tournament at Glen Abbey, beating Canadian Mike Weir in a playoff.
''I've come here a lot of times,'' Singh said. ''I've played this golf course many a times. Pretty familiar with what the golf course gives you.''
Defending champion Jhonattan Vegas was 9 under after a 69.
''I wish there were 17 Canadians 8 under or better,'' Hughes said. ''It would have been really fun to get a bunch of guys in the mix, but yeah, it's nice to have Graham in there and not to be the Lone Ranger going out there on the weekend.''
Bubba Watson matched playing partner Kuchar at 5 under, following an opening 66 with a 73.